verb (used with object), blas·phemed, blas·phem·ing.
- to speak impiously or irreverently of (God or sacred things).
- to speak evil of; slander; abuse.
verb (used without object), blas·phemed, blas·phem·ing.
- to speak irreverently of God or sacred things; utter impieties.
- (tr) to show contempt or disrespect for (God, a divine being, or sacred things), esp in speech
- (intr) to utter profanities, curses, or impious expressions
mid-14c., from Old French blasfemer “to blaspheme” (14c., Modern French blasphémer), from Church Latin blasphemare (also in Late Latin “revile, reproach”), from Greek blasphemein “to speak lightly or amiss of sacred things, to slander,” from blasphemos “evil-speaking” (see blasphemy). A reintroduction after the original word had been worn down and sense-shifted to blame. Related: Blasphemed; blaspheming.