Relating to the mind or an intellectual process. adjective
She has a mental image of her childhood home.
The mental effort required to solve the puzzle was immense.
Pertaining to disorders or illnesses of the mind. adjective
He was diagnosed with a mental disorder that affects his daily life.
The hospital specializes in treating mental health issues.
Informally, used to describe someone as crazy or insane. adjective
He's absolutely mental for trying to climb that mountain without any gear.
She went mental when she found out about the surprise party.