甲斐性かいしょうなし

noun

good-for-nothing; useless person

Used to describe someone who lacks ability, reliability, or resourcefulness, often in a critical or self-deprecating way.

• 彼かれは甲斐性かいしょうなしだと言いわれて落おち込こんだ。

  He was depressed after being called a good-for-nothing.

• 自じ分ぶんを甲斐性かいしょうなしだと思おもうな。

  Don't think of yourself as useless.