noun
1.
Synonyms: problem 2, issue, question
|| 2.
Synonyms: head 1, ||bean, ||belfry, ||coconut, ||conk, ||dome, noddle, noggin, noodle, poll
3.
Synonyms: crackpot , crackbrain, crank, cuckoo, ding-a-ling, harebrain, kook, lunatic, screwball
4.
Synonyms: lunatic 1, bedlamite, dement, loon, loony, madling, madman, maniac, non compos, Tom o' Bedlam
5.
Synonyms: enthusiast , bigot, bug, fanatic, fiend, freak, maniac, zealot