underestimate
Definitions
To estimate something as being smaller, less important, or less capable than it actually is.
To fail to appreciate the full extent or power of someone or something.
Examples
Never underestimate the power of a good night's sleep.
The team made a mistake when they chose to underestimate their opponent's defensive capabilities.
Synonyms
undervalue underrate misjudge minimize belittle discount shortchange
Antonyms
overestimate overrate overvalue exaggerate overstate overemphasize magnify