adjective

deranged

dih-RAYNJD/dɪˈreɪndʒd/

Mentally disturbed or wildly irrational.

The deranged plan adds another hole to the already leaking boat.

Wildly irrational self-defeating behavior: an adult in a small leaking rowboat deliberately drills another hole through its bottom while her companion urgently bails out the incoming water.

Etymology

deOld Frenchdo the opposite of

+rangeOld Frenchput into line

+dEnglishresulting state

Reversing 'put into line' gives the image of disrupting an orderly arrangement. Applied to the mind, this became being mentally disordered or irrational.

In context

Relaxation Cabin Manhwa Recap121:51

Zhang Lei s face twisted into a nearly deranged grin. These three knives, and you ll be crippled if not worse

My Talent Adds +1 Every Time I Drain My Stamina To Zero!

More examples

The villain made a deranged threat.
She dismissed the proposal as deranged.
His behavior appeared wildly deranged.

Forms

deranged

Similar words

irrational: Describes unreasonable thought without necessarily mental disturbance.
unhinged: An informal and potentially stigmatizing label for instability.