addlebrained C2+

/ˈædəlˌbreɪnd/ confused, muddled, or foolish

brainy C2+

/ˈbreɪni/ intelligent or clever

brainpan C2+

/ˈbreɪnˌpæn/ (informal) the skull, especially the part enclosing the brain

brainless C2+

/ˈbreɪnləs/ foolish or stupid; lacking intelligence

brainsick C2+

/ˈbreɪnsɪk/ mentally disordered; mad or deranged

scatterbrained C2+

/ˈskætɚˌbreɪnd/ disorganized and unable to concentrate; absent-minded

superbrain C2+

/ˈsupɚbreɪn/ a person of exceptional intelligence, or a vastly powerful collective mind