月つきとスッポン

expression, noun

as different as night and day; chalk and cheese; the moon and a turtle

Idiomatic expression emphasizing that two things are superficially similar but fundamentally different. Often used in the pattern ～と～は月とスッポンだ.

• 彼かれの絵えと私わたしの絵えは月つきとスッポンだ。

  His painting and mine are as different as night and day.

• あの二人ふたりの性せい格かくは月つきとスッポンほど違ちがう。

  Their personalities are as different as chalk and cheese.