力ちから任まかせ

noun, na-adjective

with all one's strength; by brute force

Often used adverbially as 力任せに to describe doing something relying solely on physical power, without finesse.

• 彼かれは力ちから任まかせにドアをこじ開あけた。

  He pried the door open with all his strength.

• 力ちから任まかせに引ひっ張ぱると壊こわれるよ。

  If you pull it with brute force, it'll break.