'looney' definitions:

Definition of 'looney'

(from WordNet)
noun
Someone deranged and possibly dangerous [syn: crazy, loony, looney, nutcase, weirdo]

Definition of 'looney'

From: GCIDE
  • looney \looney\ (l[=oo]n"[y^]) n. someone deranged and possibly dangerous.
  • Syn: crazy, loony, weirdo. [WordNet 1.5]

Definition of 'looney'

From: GCIDE
  • loony \loon"y\ (l[=oo]n"[y^]), a. [Shortened fr. lunatic.]
  • 1. Crazy; insane; lunatic; mentally unsound. [Low, U.S.] [Written also loony, luny and looney.] See Luny. [1913 Webster]
  • 2. Very foolish; very impractical; as, loony ideas. [PJC]

Definition of 'looney'

From: GCIDE
  • Luny \Lu"ny\, a. [Shortened fr. lunatic.] Crazy; insane; mentally unsound. [Written also loony and looney.] [Low, U.S.] [1913 Webster]