世せ間けん離ばなれ

noun, noun or participle which takes 'suru', intransitive verb

becoming out of touch with the world; losing common sense; being unworldly

Describes a state or process of becoming disconnected from everyday social norms and practical matters, often with a nuance of naivety or idealism. Can be used as a noun or with する to indicate the change.

See also: 世離れる

• 長なが年ねん研けん究きゅうに没ぼっ頭とうしていると、世せ間けん離ばなれしてしまうこともある。

  If you immerse yourself in research for many years, you can end up out of touch with the world.