nutcase

• nut-case

From nut +‎ case. Compare headcase, mental case etc.

• (UK) IPA^(key): /ˈnʌtkeɪs/

• Audio (General Australian):

  (file)

nutcase (plural nutcases)

1. (UK, Ireland, often humorous) An eccentric or odd person.
2. (slang, chiefly derogatory) Someone who is insane.

• (eccentric or odd person): freak, kook, nutbag, nutter, odd duck, wacko, weirdo; see also Thesaurus:strange person
• (insane person): psycho, crackpot, loon, nut, nutbag, nutter, screwball, wacko; see also Thesaurus:mad person

• Ceutans, cestuan