blasphemy (n.) Look up blasphemy at Dictionary.com
early 13c., from Old French blasfemie "blasphemy," from Late Latin blasphemia, from Greek blasphemia "a speaking ill, impious speech, slander," from blasphemein "to speak evil of." Second element is pheme "utterance" (see fame); first element uncertain, perhaps related to blaptikos "hurtful," though blax "slack (in body and mind), stupid" also has been suggested.