[ noun ] someone deranged and possibly dangerous <noun.person>
looney \looney\ (l[=oo]n"[y^]) n. someone deranged and possibly dangerous.
Syn: crazy, loony, weirdo. [WordNet 1.5]
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}.
2. Very foolish; very impractical; as, loony ideas. [PJC]
Luny \Lu"ny\, a. [Shortened fr. lunatic.] Crazy; insane; mentally unsound. [Written also {loony} and {looney}.] [Low, U.S.]
Kevin Kline, the dashing pirate king of "The Pirates of Penzance" and the looney con man of the film "A Film Called Wanda" also was a member of the initial company.