expression, noun-modifying (irregular)
insane; crazy; nuts; out of one's mind
Used to describe someone whose thinking or behavior is irrational or mentally unstable. Often carries a strong, informal, and somewhat derogatory tone. Compare with 頭がおかしい, which is a full clause rather than a prenominal modifier.
See also: 頭がおかしい
He is thought to be a crazy person.
There's no way I can agree to such an insane plan.
Means 'to go mad' or 'to lose one's mind', often more clinical or dramatic. 頭のおかしい is more colloquial and judgmental.
Standard kanji spelling for this phrase.
Ateji-like kanji spelling using 可笑しい for おかしい; less common and may appear in older or literary contexts.
Phrase composed of 頭 (head/mind) + の (possessive particle) + おかしい (strange/funny). Literally 'of a strange head', it functions as a prenominal adjective meaning 'crazy' or 'insane'.