godan verb (-ru), transitive verb
despise; look down on; make light of
Expresses a strong attitude of contempt or underestimation toward a person, ability, or situation. Often used in warnings or negative evaluations.
相手を侮ると痛い目にあう。
If you underestimate your opponent, you'll get hurt.
彼
He has an ability that cannot be underestimated just because he is young.