What four-word idioms can the brain form?

Man is not smart, he can't change his mind.

(of idle rich people) with a heavy chin and a big belly.

Rigid way of thinking

Bloody liver and brain-tragic death

Become prominent, a strong head

Exhauste all one's energy

loyal

Death skull

Stubborn (in sb's view)

think oneself terrific

Stay alert

(of idle rich people) with a heavy chin and a big belly.

A very stupid person.

rack one's brains

Abacus head

Talk in a daze.