faithless

Meanings

1. 1
   adj

   disloyal, unreliable, or unworthy of trust

   The ruler surrounded himself with faithless advisers who deserted him in the crisis.

2. 2
   adj

   sexually unfaithful to a spouse or partner

   The play centers on a faithless husband and the consequences of his deception.

3. 3
   adj

   lacking religious faith or belief

   The preacher condemned the age as faithless, though many listeners disagreed.

From Middle English feithles, formed from faith + -less. The suffix means "without" or "lacking," so the word developed both the religious sense "without faith" and the social sense "not keeping faith with another person."

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