腰こし弱よわ

na-adjective, noun

bad back; spineless person

Used both literally for a weak or painful lower back and figuratively for a person who lacks resolve or easily gives in. The figurative use is colloquial and somewhat derogatory.

• 最さい近きん、腰こし弱よわで長ちょう時じ間かん座すわっていられない。

  Lately, my bad back makes it hard to sit for long periods.

• 彼かれは腰こし弱よわだから、交こう渉しょうではすぐに折おれてしまう。

  He's spineless, so he gives in quickly during negotiations.