Englishunderrate
verb
most of us have a tendency to underrate our own skills:
undervalue, underestimate, set little store by, rate too low, not do justice to, do an injustice to, be wrong about, sell short, play down, understate, minimize, de-emphasize, underemphasize, diminish, downgrade, reduce, lessen, brush aside, gloss over, trivialize;
rare misprize, minify.
▷antonyms overrate, exaggerate.