'undervalue' and 'denigrate'

Yes. Overvalue, of course, means to have an undeserved high opinion of something.

Sometimes we encounter people who overvalue themselves. Also, there are people who denigrate themselves as they have inferiority complex.

Is 'overvalue' correctly used to mean 'have a high opinion of oneself, and does 'denigrate' mean 'think lowly of oneself'?

Thanks, Roger. What about 'denigrate'? Does it mean 'think lowly of oneself or of another person'?

Not quite. Over and undervaluing are opinions. Denigrate means saying something that attempts to lower the opinions of others.

Denigrate is to make damaging criticism.

Thanks, McTag.

Can a person denigrate himself because he has an inferiority complex? For example, he tells others he lacks confidence and is pessimistic.

Yes, but he would more likely tell people his is bad at his work rather than he is pessimistic.

Yes.