Antonyms for concur

agree, approve:

disconnect, protest, part, deny, dispute, separate, disallow, clash, disapprove, divide, dissent, argue, oppose, differ, object, refuse, reject, disjoin, disagree.

noun:

dispute, succeed, bicker, quarrel, protest, contend, follow, predate, deny, object, dissociate, split, counter, separate, diverge, rival, refuse, precede, conflict, clash, take issue, antedate, decline, resist, demur, oppose, contradict.