contradict (v.)

1570s, "speak against," also "assert the contrary" (1580s), from Latin contradictus, past participle of contradicere, in classical Latin contra dicere "to speak against," from contra "against" (see contra) + dicere "to say, speak" (from PIE root *deik- "to show," also "pronounce solemnly"). Related: Contradicted; contradicting; contradictive.