見み損そこなう

godan verb (-u), transitive verb

misjudge (someone); overestimate

Specifically for misjudging a person's character or ability, often implying disappointment when someone doesn't meet expectations.

• 君きみを見み損そこなっていたよ。こんなに頼たよりになるとは思おもわなかった。

  I misjudged you. I didn't think you were so reliable.

• あの男おとこを見み損そこなった。まさか裏うら切ぎるとは。

  I overestimated that man. I never thought he would betray me.

godan verb (-u), transitive verb

miss seeing; overlook; fail to notice

Used when one fails to see something that should have been noticed, often due to carelessness.

• 大だい事じな点てんを見み損そこなって、契けい約やく書しょにサインしてしまった。

  I overlooked an important point and signed the contract.

• 小ちいさなミスを見み損そこなったために、大おおきな事じ故こになった。

  Because I failed to notice a small mistake, it led to a major accident.