A crazy person is someone who behaves in an irrational or unpredictable way. The crossword solutions for this term include 'MANIAC' (6 letters), 'SCREWBALL' (9 letters), 'NUT' (3 letters), 'MADCAP' (6 letters), 'CRACKPOT' (8 letters), 'LUNATIC' (7 letters), 'LOON' (4 letters), 'lntc' (4 letters), 'NUTCASE' (7 letters), 'ECCENTRIC' (9 letters), 'FRUITCAKE' (9 letters), and 'WACKADOODLE' (11 letters). All of these words are slang terms used to describe someone who is acting in a strange or unusual manner.