投なげやり

na-adjective, noun

negligent; careless; halfhearted; irresponsible

Describes an attitude or action that is sloppy, lacking proper care, or done without commitment. Often used for work, attitude, or responses that are offhand or reckless.

• 彼かれの投なげやりな仕し事ごとぶりにはがっかりした。

  I was disappointed by his negligent way of working.

• そんな投なげやりな態たい度どでは成せい功こうできないよ。

  You can't succeed with such a halfhearted attitude.