All certify antonyms

verb certify

• deny — When you deny something, you state that it is not true.
• reject — to refuse to have, take, recognize, etc.: to reject the offer of a better job.
• disallow — to refuse to allow; reject; veto: to disallow a claim for compensation.
• refuse — to decline to accept (something offered): to refuse an award.
• disprove — to prove (an assertion, claim, etc.) to be false or wrong; refute; invalidate: I disproved his claim.
• invalidate — to render invalid; discredit.
• veto — the power or right vested in one branch of a government to cancel or postpone the decisions, enactments, etc., of another branch, especially the right of a president, governor, or other chief executive to reject bills passed by the legislature.
• disapprove — to think (something) wrong or reprehensible; censure or condemn in opinion.
• disclaim — to deny or repudiate interest in or connection with; disavow; disown: disclaiming all participation.
• renounce — to give up or put aside voluntarily: to renounce worldly pleasures.
• conceal — If you conceal something, you cover it or hide it carefully.
• hide — Informal. to administer a beating to; thrash.
• refute — to prove to be false or erroneous, as an opinion or charge.
• contradict — If you contradict someone, you say that what they have just said is wrong, or suggest that it is wrong by saying something different.
• counteract — To counteract something means to reduce its effect by doing something that produces an opposite effect.
• disavow — to disclaim knowledge of, connection with, or responsibility for; disown; repudiate: He disavowed the remark that had been attributed to him.
• repudiate — to reject as having no authority or binding force: to repudiate a claim.
• oppose — to act against or provide resistance to; combat.
• discredit — to injure the credit or reputation of; defame: an effort to discredit honest politicians.