絵に描いた餅

Japanese

Etymology

From (e, picture, painting) +‎ +‎ 描く (kaku, to draw) +‎ (mochi, rice cake). Literally, a drawing of a rice cake.

Noun

絵に描いた餅

  1. (idiomatic) pie in the sky, castle in the air; a useless thing or idea (clarification of this definition is needed)