Synonyms of scatterbrain

1 Syllable
nut, kook, schnook, loon, crank
2 Syllables
flake, crackpot, cuckoo, dunce, maniac, psycho
3 Syllables
psychopath, psychotic, neurotic, paranoid, fruitcake, demoniac, lamebrain
4 Syllables
schizophrenic, sociopathic