unsubstantial

adj

1. insubstantial, fanciful, fancied, imaginary, imagined, chimerical, unreal, visionary, quixotic; airy, vaporous, wild, idle, empty; fantastic, make-believe, mythical, fairy-tale, fictitious, made-up; illusory, illusive, delusive, false, hallucinatory, phantom, phantasmal, spectral, ghostly; intangible, impalpable, immaterial, incorporeal, disembodied, bodiless.

2. paltry, inadequate, insufficient, meager, mere, small, puny, dinky, Sl. lousy, Sl. crummy; insignificant, unimportant, of little or no import, negligible, nugatory, inconsiderable, inconsequential; trivial, trifling, petty, niggling, minor, piddling, Inf. picayune.

3. flimsy, tenuous, poor, worry, weak, lame; shallow, superficial, cursory; ungrounded, groundless, unfounded, unsupported, unbased, baseless; illogical, unlogi-cal, unsound, fallacious, erroneous, faulty, Inf. full of holes, untenable; feeble, frail, fragile, slight, thin, watery, watered-down; delicate, dainty, light, fine, sheer, diaphanous, ethereal, gauzy, gossamer, cobweb by; cheap, Sl. cheesy, inferior, Inf. no-good, useless, worthless, rickety, jerry-built; jury-rigged, makeshift, stopgap.