having impact on one's emotions, causing one to behave rashly

Midbrain

leader; mastermind

dumb; stupid; literally 'pig-brained'

cerebral

literally 'brainless'; describes someone who acted brainlessly or recklessly

use one's brain

Right brain; the right cerebral hemisphere

man who is unfulfilled sexually

not thinking; mindless (spoken)

immerse oneself in

a silly and inexperienced person who always gets cheated by others

brain

Cerebral cortex

the mastermind behind the scene [written and colloquial]

tablet computer

back of the head

nervous, scared, stiff and cowardice

stupid, dumb

laptop

Playing computer games

wagging one's head smugly, looking pleased with oneself (self-conceit)

cannot make head or tail of something

government head

camphor

'ROM brain'

brainwash

brainwashing song

mind-blowing

slow witted; thick headed [written and colloquial]