Absurd, Airy, Apish, Asinine, Balmy, Batty, Bedazzled, Beguiled, Besotted, Blockhead, Booby, Brainless, Childish, Clod, Clot, Cockeyed, Crazy, Credulous, Daffy, Daft, Daze, Dazed, Dazzled, Unwise, Vacuous, Vain, Vapid, Wacky, Wet, Windy, Witless, Dizzy, Dolt, Dope, Dopey, Doting, Drip, Dumb, Dummy, Dunce, Empty, Fatuous, Flaky, Flighty, Flimsy, Fond, Fool, Foolhardy, Foolish, Frivolous, Frothy, Fuddled, Futile, Gaga, Giddy, Goofy, Goose, Groggy, Harebrained, Idiot, Idiotic, Idle, Ignoramus, Ignorant, Illogical, Imbecile, Imbecilic, Inane, Inept, Infatuated, Insane, Irrational, Irresponsible, Jackass, Jerk, Laughable, Light, Loony, Ludicrous, Mad, Maudlin, Moronic, Nerd, Nincompoop, Ninny, Nitwit, Nonsensical, Numskull, Nutty, Off, Pointless, Preposterous, Puerile, Punchy, Ridiculous, Risible, Rubbishy, Screwy, Senseless, Sentimental, Shallow, Simpleton, Slender, Slight, Stunned, Stupefied, Stupid, Superficial, Thoughtless, Trashy, Trifling, Trite, Trivial, Twit, Unintelligent, Unreasonable