Of unsound mind; insane; demented.
Out of control.
In love; experiencing romantic feelings.
Very excited or enthusiastic.
Very unexpected; wildly surprising.
Very, extremely.
An insane or eccentric person; a crackpot.
Eccentric behaviour; lunacy; craziness.
That induces a temporary state of altered perception and symptoms similar to those of psychosis (such as hallucinations).
Any psychotomimetic drug, such as LSD.