Answer: confute

AnswerCrossword Clue
CONFUTEOverwhelm by argument.
CONFUTEProve to be wrong.
CONFUTEProve false
CONFUTEOverwhelm by argument
confuteto prove wrong
confuteto refute conclusively.
confuteto disprove (to refute (to prove to be false or erroneous, also REBUT))