常じょう識しきはずれ

noun which may take the genitive case particle 'no', na-adjective, noun

unconventional; eccentric; out of touch with common sense

Describes a person, behavior, or idea that deviates from what is generally considered sensible or normal. Often carries a negative or critical tone.

• 彼かれの常じょう識しきはずれな発はつ言げんに、みんな驚おどろいた。

  Everyone was surprised by his unconventional remark.

• そんな常じょう識しきはずれの計けい画かくは通とおらないよ。

  Such an outlandish plan won't be accepted.