underestimated
adj.adj. describing something that is better, stronger, or more important than people think it is. You use this when someone fails to realize the true value or power of a person or thing.
adj. regarded as less capable, powerful, or significant than is actually the case. Often used predicatively after linking verbs like 'be' or 'remain'.
The small team was underestimated by their rivals.
The complexity of the software update was underestimated, leading to several unexpected bugs during the launch.
Though she appeared quiet and unassuming, her influence within the boardroom was frequently underestimated by those who mistook her silence for a lack of conviction.
Often follows linking verbs such as 'be', 'remain', or 'stay'; can also be used attributively before a noun.