What is an antonym of concur?

The opposite (antonym) of antonym is synonym. An antonym is a word that means the opposite. A synonym is a word that means the same thing, or nearly the same thing, for a given context.

"I concur with your findings " is an example of its use

disagree, disapprove, object, reject, oppose

out.

Some words do not have opposites [antonyms]. The word "where" has no antonym.