Credulous, Daffy, Daft, Dazed, Dizzy, Doomed, Doting, Dumb, Effete, Empty, Failing, Fatuous, Feckless, Flaky, Flimsy, Fond, Fool, Foolish, Frivolous, Frothy, Fruitless, Fuddled, Gaga, Goofy, Hollow, Idiotic, Idle, Imbecile, Impolitic, Impotent, Improper, Inadequate, Inadvisable, Inane, Inappropriate, Incongruous, Ineffective, Ineffectual, Inefficient, Inept, Inexpedient, Infatuated, Infelicitous, Inoperative, Inopportune, Insane, Insufficient, Invalid, Lame, Light, Loony, Mad, Maudlin, Miscarried, Miscarrying, Moronic, Nutty, Profitless, Screwy, Senseless, Sentimental, Shallow, Silly, Slender, Slight, Sterile, Stillborn, Stupid, Superficial, Thoughtless, Trifling, Trite, Trivial, Unavailable, Unavailing, Undesirable, Unfit, Unfitting, Unfortunate, Unhappy, Abortive, Absurd, Airy, Apish, Asinine, Bad, Barren, Batty, Beguiled, Besotted, Bootless, Brainless, Cockeyed, Counterproductive, Crazy, Unproductive, Unprofitable, Unsatisfactory, Unseasonable, Unseemly, Unsuccessful, Unsuitable, Untimely, Unwise, Useless, Vacuous, Vain, Vapid, Wacky, Wet, Windy, Witless, Worthless, Wrong