An insane or eccentric person; a crackpot.
Eccentric behaviour; lunacy; craziness.
Very, extremely.
Out of control.
Of unsound mind; insane; demented.
In love; experiencing romantic feelings.
Very excited or enthusiastic.
Very unexpected; wildly surprising.
A person who is obsessed with a single thing, to the exclusion of other concerns.
Focused on one thing above all others.