to fail to understand how strong, skillful, intelligent, or determined someone, especially a competitor, is
We lost the game because we underestimated the other team’s skill.
It would be a mistake to underestimate her ability to overcome challenges.
Teams often regret when they underestimate the skills of their opponents.
Never underestimate the power of a well-prepared and determined individual.
It's essential not to underestimate the impact of small, consistent efforts.