too clever by half
過于聰明反而給人以不好的印象或引起麻煩
口語·書面·批評聰明反被聰明誤
英文釋義
to be excessively or arrogantly clever, leading to negative consequences
例句
His plan was too clever by half and ended up backfiring.
典故來源
源自19世紀英國，half表示程度，意為聰明過頭反而帶來負面效果。