adj ·3 syllables ·Moderate ·College level

Definitions

Adjective

1. 1
   Not having religious faith.
2. 2
   Not keeping good faith; disloyal; not faithful.
3. 3
   Adulterous.
4. 4
   Not honest or upright.
5. 5
   Negligent or imperfect.

   "The painting was an unfaithful rendering of its subject."

Show 1 more definition

6. 6
   Not faithfully rendering the meaning of the source language; incorrect.

Adjective

1. 1
   not trustworthy wordnet
2. 2
   not true to duty or obligation or promises wordnet
3. 3
   having sexual relations with someone other than your husband or wife, or your boyfriend or girlfriend wordnet
4. 4
   having the character of, or characteristic of, a traitor wordnet

Synonyms

All synonyms

treacherousuntruenonfaithfuladulterousapostatebooky

Antonyms

All antonyms

charymeticulousfaithful

Example

More examples

"A cat is an unfaithful servant which we only keep by necessity."

Etymology

From Middle English unfeithful, equivalent to un- + faithful.

Related phrases

source language

Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.