ないものねだり

noun

asking for the impossible; wanting what one doesn't have

Describes the act of wishing for something unattainable or complaining about not having something unrealistic. Often used as a set phrase.

• 彼かれはいつもないものねだりをしている。

  He's always asking for the impossible.

• ないものねだりしても仕し方かたがないよ。

  There's no point in wishing for what you can't have.