1. nutso - Noun
2. nutso - Adjective
3. nutso - Adverb
(colloquial) Crazy, insane.
(colloquial) Fraught or out of control.
(colloquial) Obsessed; overly enthusiastic.
(colloquial) Ridiculous; unbelievable or silly.
(colloquial, countable) A crazy person; a crackpot or lunatic.
(colloquial, uncountable) Craziness; insanity.
(colloquial) Madly; extremely or obsessively.
(colloquial) In a crazy manner.
Source: en.wiktionary.org