underestimate
un-der-es-ti-mate
verb
To judge something or someone as less capable or important than they truly are.
"Never underestimate the power of a good cup of tea."
noun
A judgement that something or someone is less capable or important than they are.
"His initial assessment was a serious underestimate."
Thesaurus
Synonyms: lowball, undervalue, underrating, underreckoning, underestimation, underrate
Antonyms: overestimate, overrate, overvalue