underestimate [underestimated, underestimating, underestimates](to perceive as having lower value) verb [UK: ˌʌn.də.ˈre.stɪ.meɪt] [US: ˈʌn.də.ˈre.stə.ˌmet]I've underestimated the strength of my opponent. = Ho sottostimato la forza del mio avversario.