http://www.bartleby.com/62/15/D0431500.htmldippy
ADJECTIVE: Slang. So senseless as to be laughable: absurd, foolish, harebrained, idiotic, imbecilic, insane, lunatic, mad, moronic, nonsensical, preposterous, silly, softheaded, tomfool, unearthly, zany. Informal : cockeyed, crazy, loony, loopy. Slang : balmy2, dopey, jerky, sappy, wacky.