abjure assert the contrary belie contest contradict contravene controvert counter cross deny disaffirm disallow disavow disbelieve disclaim discredit disown disprove dispute forswear gag on gainsay impugn join issue upon misbelieve negate not accept not believe not buy not swallow nullify oppose recant refuse to admit refuse to credit refute reject renounce repudiate retract revoke take back take issue with unbelieve