overestimates
o-ver-es-ti-mates
verb
To estimate something's value, size, or importance as greater than it actually is.
"He often overestimates his own capabilities."
Thesaurus
Synonyms: overvalue, overestimate, overappraisal, overvaluation, overestimation, overrate, overreckoning, overrating
Antonyms: underestimate, underrate, undervalue