loony

Estimated CEFR level: C2 — Proficiency

Estimated from word frequency; not an official CEFR classification.

Definition

  1. noun someone deranged and possibly dangerous
  2. adjective informal or slang terms for mentally irregular

Etymology

Shortened from lunatic, and likely also from loon ("rascal", and also the bird) + -y.

In classic literature

Synonyms

crazy, looney, nutcase, weirdo

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