From English - German Ding/FreeDict dictionary ver. 1.9-fd1:
nutter /nˈʌtə/ [Br.] Spinner <masc>, Spintisierer <masc>, Spökenkieker <masc> [Norddt.] Synonyms: crackpot, crank, kook, screwball, flake, wacko, whacko
see: crackpots, nutters, cranks, kooks, screwballs, flakes, wackos, whackos
From English - German Ding/FreeDict dictionary ver. 1.9-fd1:
nutter /nˈʌtə/ [coll.] Verrückte <masc, fem>