What does faithless mean?
Faithless is an adjective describing someone who betrays a trust, promise, or allegiance — a faithless friend abandons you, a faithless lover strays, and a faithless ally switches sides when it suits them. The word derives from 'faith' combined with the suffix '-less,' literally meaning without faith, and it entered English by the Middle Ages as both a religious term for those lacking belief and a moral term for the disloyal. Today its dominant use is secular: it condemns breaches of loyalty in personal relationships, politics, and friendship. Its tone is formal and strongly condemnatory, with a slightly literary flavor that sets it apart from everyday alternatives like 'unfaithful' or 'disloyal.' One notable modern survival is the American political phrase 'faithless elector,' used for Electoral College members who vote against the candidate they pledged to support. The word's built-in opposites — faithful, loyal, steadfast — make its meaning immediately legible even to readers encountering it for the first time.
adjectiveUnfaithful or disloyal; breaking a promise, trust, or allegiance that has been given. It can also describe something done without faith or belief.
- Breaking a promise, vow, or allegiance; unfaithful or disloyal (especially to a partner, friend, or cause).
- Done or held without religious faith or belief; lacking conviction.
"He proved a faithless friend, abandoning her the moment her fortunes declined."
"The general was executed for leading a faithless revolt against the king he had sworn to serve."
"She could not forgive his faithless conduct during their long engagement."
In US presidential elections, an elector who breaks their pledge to a candidate is officially called a 'faithless elector' — the word still polices loyalty centuries after it was coined.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of faithless
Faithless derives from the Old French 'feit'/'fai' and ultimately from Latin 'fides,' meaning trust or belief, which also gives us 'fidelity,' 'infidel,' and 'confidence.' Formed from 'faith' plus the suffix '-less,' it appeared in English during the medieval period, where it served both as a religious label for unbelievers and as a charge of disloyalty. The same Latin root runs through the entire family of words about keeping and breaking trust, making faithless part of one of English's oldest moral vocabularies.
Related word forms
How faithless is actually used
The word carries strong negative connotation and sounds somewhat literary or formal in modern usage; 'unfaithful' and 'disloyal' are more common in everyday speech, though 'faithless' remains standard in political contexts such as 'faithless elector.' The sense relating to lack of religious belief is now comparatively rare and slightly archaic.
Easily confused with faithless
Faithless means disloyal and untrustworthy, while faithful means loyal and steadfast — they are near-opposites despite sharing the same root.
Feckless means lacking initiative, effectiveness, or responsibility, whereas faithless means breaking faith or loyalty.