Translation of "mistakenly" into Japanese

There's a body that was mistakenly sent here to this hospital.

誤 っ て こちら へ 送 ら れ た 患者 が い ま す

I've mistakenly deleted the party information and registration you sent to me.

パーティーの案内と申込書を間違って削除してしまいました。

We mistakenly believe that capitalism begets inevitably democracy.

資本主義こそが民主主義を生み出すと 誤解していますが