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loony

loon·y

loony

pronunciation:
lu ni
parts of speech:
adjective, noun
part of speech: adjective
inflections: loonier, looniest
definition 1: (informal) silly; foolish.
similar words:
insane, zany
definition 2: insane; crazy; lunatic.
similar words:
crazy, insane, lunatic
 
part of speech: noun
inflections: loonies
definition: (informal) one who has a loony personality or who exhibits loony behavior.
derivation: looniness (n.)