mental

Of or relating to the mind or an intellectual process.

Insane, mad, crazy.

"He is the most mental freshman I've seen yet."

Enjoyable or fun, especially in a frenetic way.

"That was a mental party last night."

A plate or scale covering the mentum or chin of a fish or reptile.

Of or relating to the chin or median part of the lower jaw, genial.

"the mental nerve;  the mental region"

Of or relating to the chin-like or lip-like structure.