Meaning

noun blasphemous language (expressing disrespect for God or for something sacred)

noun blasphemous behavior; the act of depriving something of its sacred character

originFrom Middle English blasfemie, from Old French blasfemie, from Ecclesiastical Latin blasphēmia, from Ancient Greek βλασφημία (blasphēmía, “profanity”), from βλασφημέω (blasphēméō, “to slander”). Displaced native Old English tāl.

Etymology from Wiktionary, CC BY-SA 3.0