Synonyms and related words :
NG, airy, asinine, barren, bootless, catchpenny, cheap, counterproductive, effete, empty, etiolated, fatuitous, fatuous, feckless, flimsy, foolish, fribble, fribbling, frivolous, frothy, fruitless, futile, good-for-naught, good-for-nothing, hollow, idle, inadequate, inane, ineffective, ineffectual, inefficacious, inoperative, invalid, junk, junky, light, no-account, no-good, not worth having, not worth mentioning, not worthwhile, nugacious, of no force, otiose, shabby, shallow, shoddy, silly, slender, slight, sterile, superficial, trashy, trifling, trite, trivial, unavailing, useless, vacuous, vain, valueless, vapid, windy, worthless