ἄπιστος
unfaithful
‘unfaithful’ is one of 3 main senses fuller range ↓
Full lexicon entry — Thayer's Greek Lexicon
From Thayer's Greek Lexicon
Where this word appears
See every Nominative-case word in the Greek New Testament →
Grammar key — what these labels mean
Part of speech
- Adjective
- A word that describes or qualifies a noun.
Case
- Dative
- The case of the indirect object, means, or location — “to / for / with / in.”
- Genitive
- The case of source, possession, or “of” — answers “whose / from what.”
- Nominative
- The case of the subject (and the predicate nominative).
- Vocative
- The case of direct address (“O Lord”).
- Accusative
- The case of the direct object and of extent.
Gender
- Masculine
- Grammatically masculine.
- Feminine
- Grammatically feminine.
Number
- Plural
- More than one.
- Singular
- One.
Every verse where G571 appears in the Book of 1 Corinthians — 9 distinct verses. Click any verse to open its interlinear word-by-word view. Verse text shown in the World English Bible for context — . Each verse’s Greek form is shown with its reference; the English is not keyword-highlighted, since the data carries no word-level English alignment. Use “Compare translations” on any verse to read it across multiple English versions. This concordance covers the Greek New Testament; Septuagint (Greek Old Testament) occurrences of this word are not indexed here.
1 Corinthians
- 1 Corinthians 6:6 ἀπίστων adj gen pl masc But brother goes to law with brother, and that before unbelievers!
- 1 Corinthians 7:12 ἄπιστον adj acc sg fem But to the rest I--not the Lord--say, if any brother has an unbelieving wife, and she is content to live with him, let him not leave her.
- 1 Corinthians 7:13 ἄπιστον adj acc sg masc The woman who has an unbelieving husband, and he is content to live with her, let her not leave her husband.
- 1 Corinthians 7:14 ἄπιστος ἄπιστος adj nom sg masc adj nom sg fem For the unbelieving husband is sanctified in the wife, and the unbelieving wife is sanctified in the husband. Otherwise your children would be unclean, but now are they holy.
- 1 Corinthians 7:15 ἄπιστος adj nom sg masc Yet if the unbeliever departs, let there be separation. The brother or the sister is not under bondage in such cases, but God has called us in peace.
- 1 Corinthians 10:27 ἀπίστων adj gen pl masc But if one of those who don't believe invites you to a meal, and you are inclined to go, eat whatever is set before you, asking no questions for the sake of conscience.
- 1 Corinthians 14:22 ἀπίστοις ἀπίστοις adj dat pl masc adj dat pl masc Therefore other languages are for a sign, not to those who believe, but to the unbelieving; but prophesying is for a sign, not to the unbelieving, but to those who believe.
- 1 Corinthians 14:23 ἄπιστοι adj nom pl masc If therefore the whole assembly is assembled together and all speak with other languages, and unlearned or unbelieving people come in, won't they say that you are crazy?
- 1 Corinthians 14:24 ἄπιστος adj nom sg masc But if all prophesy, and someone unbelieving or unlearned comes in, he is reproved by all, and he is judged by all.
About this entry
At a glance — auto-summarized from this page’s data, not written by a person. Every figure links to its source below. This summary describes the numbers; it doesn’t interpret them.
απιστος (ápistos) is a Greek adjective most often rendered “unfaithful.” It first appears in Matthew 17:17. The Greek New Testament uses it across 21 verses — uncommon. 1 Corinthians dominates its distribution — 9 of 21 verses. Ranging over 3 senses, it is not a single-sense word. The sections below give every sense, occurrence, and version rendering.
Gloss history
Strong's 1890 vs modern scholarship
About this word
Strong's G571 catalogs a Greek word from the Greek New Testament.
These counts are not copied from any lexicon or concordance. They are computed here, from the morphology-tagged Greek New Testament. What Lemma adds →
- 21
- distinct verses
- The word appears in 21 distinct verses.
- 10 / 27
- NT books
- The word appears in 10 of 27 New Testament books.
- #563
- by frequency
- Top 1000 most frequent Greek words (rank 563 of 5,347 Greek words by occurrence).
View all 21 occurrences in the concordance →
Most concentrated in
- 1 Corinthians 9 verses 43%
- 2 Corinthians 3 verses 14%
- Luke 2 verses 10%
By section of the New Testament
By traditional corpus
Conventional, traditional groupings — biblical authorship is debated, so this is a traditional corpus grouping, not an authorship claim. Some books belong to more than one corpus (Luke is in both the Gospels and the Lukan corpus, and so on), so these shares overlap and need not total 100%. Each figure is a share of the word’s 21 distinct verses.
- Pauline corpus 14 verses · 67%
- Gospels 5 verses · 24%
- Lukan (Luke–Acts) 3 verses · 14%
- Johannine 2 verses · 10%
- Revelation 1 verse · 5%
How translations render this word
Counts come from each version’s own published word-to-Strong’s tagging or interlinear alignment — an approximate guide to how each version renders this word, not a word-level alignment the data otherwise carries. Because each total is that version’s own tagged count, the per-version totals vary from one another and need not match the appearance or distinct-verse counts above. These counts may also differ from a printed concordance because Lemma counts each distinctly tagged rendering and does not collapse phrase taggings into a single head-word total. This is a fixed set of word-tagged versions (KJV, ASV, BSB, ULT) and does not change with the reading translation you choose elsewhere. Each version’s license is shown beside its name below (and on Sources).
- King James Version: Unbelieving 5×, Believe not 4×, Faithless 4×
- American Standard Version: Unbelieving 12×, Faithless 4×, Unbelievers 2×
- Berean Standard Bible: Unbelieving 9×, Unbelievers 6×, Unbeliever 5×
- unfoldingWord Literal Text: Unbelieving 10×, Unbelievers 7×, Unbeliever 4×
King James Version Public Domain
Renders G571 across 23 tagged occurrences — most commonly:
Plus 1 rendering that appears only once — usually multi-word phrases or single function words the recovered tagging swept in, not distinct renderings.
American Standard Version Public Domain
Renders G571 across 24 tagged occurrences — most commonly:
Plus 6 renderings that appear only once — usually multi-word phrases or single function words the recovered tagging swept in, not distinct renderings.
Berean Standard Bible Public Domain
Renders G571 across 23 tagged occurrences — most commonly:
Plus 3 renderings that appear only once — usually multi-word phrases or single function words the recovered tagging swept in, not distinct renderings.
unfoldingWord Literal Text CC BY-SA 4.0
Renders G571 across 23 tagged occurrences — most commonly:
Plus 2 renderings that appear only once — usually multi-word phrases or single function words the recovered tagging swept in, not distinct renderings.
Senses in Thayer's
The 3 senses Thayer's distinguishes for this word, in lexicon order (not ranked by frequency or importance). The full entry — with sub-senses — is in the Lexicon Entry tab.
- unfaithful, faithless, (not to be trusted, perfidious)
- incredible
- unbelieving, incredulous
Word origin
Derived from Α (A) (G1) — alpha.
From G1 (as a negative particle) and G4103 ; (actively) disbelieving that is without Christian faith (specifically a heathen ); (passively) untrustworthy (person) or incredible (thing): - that believeth not faithless incredible thing infidel unbeliever (-ing).
— Strong’s Exhaustive Concordance (1890), public domain.
Forms in the corpus
The 6 distinct written forms G571 takes in the Greek New Testament, most frequent first — each parse links to that case’s occurrences in the concordance.
| Form | Parsing | Example | Uses |
|---|---|---|---|
| ἄπιστος ápistos | Adjective, Nominative, Singular, Masculine | John 20:27 | 8 |
| ἀπίστοις apístois | Adjective, Dative, Plural, Masculine | 1 Corinthians 14:22 | 5 |
| ἀπίστων apístōn | Adjective, Genitive, Plural, Masculine | Luke 12:46 | 4 |
| ἄπιστον ápiston | Adjective, Accusative, Singular, Masculine | Acts 26:8 | 3 |
| ἀπίστου apístou | Adjective, Genitive, Singular, Masculine | 2 Corinthians 6:15 | 2 |
| ἄπιστοι ápistoi | Adjective, Nominative, Plural, Masculine | 1 Corinthians 14:23 | 1 |
Same root — word family
Other Thayer's entries built from the same root as G571, grouped by Strong’s listed origin. These share a root / origin per the lexicon — not necessarily a shared meaning. Each links to that word’s own entry.
Derives from
Shares the same root
- αβαρης abarḗs G4 light
- αβυσσος ábyssos G12 abyss
- αγαμος ágamos G22 unmarried
- αγενεαλογητος agenealógētos G35 without genealogy
- αγενης agenḗs G36 ignoble
- αγναφος ágnaphos G46 unprocessed
- αγνοεω agnoéō G50 to be ignorant
- αγνωσια agnōsía G56 ignorance
- αγνωστος ágnōstos G57 unknown
- αγραμματος agrámmatos G62 unlearned
- αγρυπνεω agrypnéō G69 to watch
- αδαπανος adápanos G77 free
- αδελφος adelphós G80 brother
- αδηλος ádēlos G82 obscure
- αδης háidēs G86 hell
- αδιακριτος adiákritos G87 clear
- αδιαλειπτος adiáleiptos G88 continual
- αδικος ádikos G94 unjust
- αδοκιμος adókimos G96 unapproved
- αδολος ádolos G97 guileless
- αδυνατος adýnatos G102 weak
- αζυμος ázymos G106 unleavened
- αθανασια athanasía G110 immortal
- αθεμιτος athémitos G111 unlawful
+149 more words share this root (not shown).
Derived from this word
Proper names from this root
People and places named from this root — a name, not an additional meaning of the word.
Compare all same-root words → Showing 4 of 178 — not the complete family. 1 of the same-root words is a proper name (a person or place). They share a root, not necessarily a meaning.
Septuagint usage
The same Greek word απιστος appears 3 times in the Greek Old Testament (Septuagint), across 2 verses in 2 books.
- 3
- LXX occurrences
- Tagged occurrences of this Greek word in the Septuagint.
- 2
- verses
- Distinct Septuagint verses containing this word.
- 2 / 39
- OT books
- The word appears in 2 of the 39 Old Testament books.
Sample Septuagint occurrences
- Proverbs 17:6 ἄπιστος
- Isaiah 17:10 ἄπιστος
Septuagint occurrences (same lexeme)
Every verse where the same Strong’s number (G571) appears in the Greek Septuagint. Verse text shown in the World English Bible for context; the Greek form is the matched word — the English is not keyword-highlighted.
- Proverbs 17:6 ἄπιστος Children's children are the crown of old men; The glory of children are their parents.
- Isaiah 17:10 ἄπιστος For you have forgotten the God of your salvation, and have not been mindful of the rock of your strength; therefore you plant pleasant plants, and set it with strange slips.
These are occurrences of the same Greek lexeme (G571) in the Septuagint — not a translation of any one Hebrew word. The store carries no word-level Hebrew↔Greek alignment, so no Hebrew original is asserted here. Counts come from the recovered LXX Strong's tagging — high-frequency vocabulary is well covered, while rare or late forms may be untagged — so they reflect tagged occurrences and may slightly undercount.
