unsubstantial

• POS: Adjective
• HYPHEN: un=sub=stan=tial

CIDE DICTIONARY

unsubstantial, a. 

 Lacking in matter or substance; visionary; chimerical.  [1913 Webster]

OXFORD DICTIONARY

unsubstantial, adj. having little or no solidity, reality, or factual basis.

Derivative

unsubstantiality n. unsubstantially adv.

THESAURUS

unsubstantial

Barmecidal, Barmecide, adulterated, airy, apparent, apparitional, asomatous, astral, attenuate, attenuated, autistic, bodiless, breakable, brittle, cheap-jack, chimeric, cobwebby, crumbling, crumbly, cut, dainty, dangerous, decarnate, decarnated, deceptive, decrepit, delicate, delicately weak, delusional, delusionary, delusive, delusory, dereistic, desultory, dilute, diluted, discarnate, disembodied, disintegrating, dreamlike, dreamy, effeminate, erroneous, ethereal, extramundane, fallacious, false, fanciful, fantastic, feeble, fine, flimsy, fragile, frail, frangible, gaseous, ghostly, gimcrack, gimcracky, gossamery, hazardous, illusional, illusionary, illusive, illusory, imaginary, immaterial, impalpable, imponderable, improbable, inconceivable, inconclusive, incorporate, incorporeal, incredible, infirm, insecure, insubstantial, intangible, jerry, jerry-built, light, lightweight, merely nominal, metaphysical, misleading, namby-pamby, nonmaterial, nonphysical, nonsubstantial, not real, occult, ostensible, otherworldly, papery, pasteboardy, perilous, phantasmagoric, phantasmal, phantom, poor, poorish, precarious, provisional, psychic, puny, rare, rarefied, risky, rotten, rotten at, seeming, self-deceptive, self-deluding, shadowy, shaky, shattery, shifting, shifty, sissified, sleazy, slight, slippery, specious, spectral, spiritual, subtile, subtle, supernatural, supposititious, tacky, temporary, tentative, tenuous, thick, thin, thinned, thinned-out, ticklish, transmundane, treacherous, unactual, unbelievable, uncompact, uncompressed, unconcrete, unconvincing, undependable, unearthly, unembodied, unextended, unfaithworthy, unfirm, unfleshly, unfounded, unphysical, unproved, unreal, unrealistic, unreliable, unrigorous, unsolid, unsound, unstable, unsteadfast, unsteady, unsturdy, unsubstanced, unsure, unsustained, untrustworthy, unworldly, vaporous, visionary, watered, watered-down, weak, weakly, weightless, windy, wispy, womanish

ROGET THESAURUS

unsubstantial

Inexistence

N inexistence, nonexistence, nonsubsistence, nonentity, nil, negativeness, nullity, nihility, nihilism, tabula rasa, blank, abeyance, absence, no such thing, nonbeing, nothingness, oblivion, annihilation, extinction, extinguishment, extirpation, Nirvana, obliteration, inexistent, nonexistent, negative, blank, missing, omitted, absent, insubstantial, shadowy, spectral, visionary, unreal, potential, virtual, baseless, in nubibus, unsubstantial, vain, unborn, uncreated, unbegotten, unconceived, unproduced, unmade, perished, annihilated extinct, exhausted, gone, lost, vanished, departed, gone with the wind, defunct, fabulous, ideal, supposititious &c, negatively, virtually, non ens.

Unsubstantiality

N unsubstantiality, insubstantiality, nothingness, nihility, no degree, no part, no quantity, no thing, nothing, naught, nil, nullity, zero, cipher, no one, nobody, never a one, ne'er a one, no such thing, none in the world, nothing whatever, nothing at all, nothing on earth, not a particle, all talk, moonshine, stuff and nonsense, matter of no importance, matter of no consequence, thing of naught, man of straw, John Doe and Richard Roe, faggot voter, nominis umbra, nonentity, flash in the pan, vox et praeterea nihil, shadow, phantom, dream, ignis fatuus, such stuff as dreams are made of, air, thin air, vapor, bubble, baseless fabric of a vision, mockery, hollowness, blank, void, inanity, fool's paradise, unsubstantial, baseless, groundless, ungrounded, without foundation, having no foundation, visionary, immaterial, spectral, dreamy, shadowy, ethereal, airy, cloud built, cloud formed, gossamery, illusory, insubstantial, unreal, vacant, vacuous, empty, eviscerated, blank, hollow, nominal, null, inane, there's nothing in it, an ocean of dreams without a sound.

Weakness

N weakness, debility, atony, relaxation, languor, enervation, impotence, infirmity, effeminacy, feminality, fragility, flaccidity, inactivity, anaemia, bloodlessness, deficiency of blood, poverty of blood, declension of strength, loss of strength, failure of strength, delicacy, invalidation, decrepitude, asthenia, adynamy, cachexy, cachexia, sprain, strain, reed, thread, rope of sand, house of cards, softling, weakling, infant, youth, weak, feeble, debile, impotent, relaxed, unnerved sapless, strengthless, powerless, weakly, unstrung, flaccid, adynamic, asthenic, nervous, soft, effeminate, feminate, womanly, frail, fragile, shattery, flimsy, unsubstantial, insubstantial, gimcrack, gingerbread, rickety, creaky, creaking, cranky, craichy, drooping, tottering, broken, lame, withered, shattered, shaken, crazy, shaky, palsied, decrepit, languid, poor, infirm, faint, faintish, sickly, dull, slack, evanid, spent, short-winded, effete, weather-beaten, decayed, rotten, worn, seedy, languishing, wasted, washy, laid low, pulled down, the worse for wear, unstrengthened, unsupported, unaided, unassisted, aidless, defenseless, cantilevered (support), on its last legs, weak as a child, weak as a baby, weak as a chicken, weak as a cat, weak as a rat, weak as water, weak as water gruel, weak as gingerbread, weak as milk and water, colorless, non sum qualis eram.

Rarity

N rarity, tenuity, absence of solidity, subtility, subtilty, subtlety, sponginess, compressibility, rarefaction, expansion, dilatation, inflation, subtilization, vaporization, evaporation, diffusion, gassification, ether, rare, subtile, thin, fine, tenuous, compressible, flimsy, slight, light, cavernous, spongy, rarefied, unsubstantial, uncompact, incompressed, rarefiable.

Error

N error, fallacy, misconception, misapprehension, misstanding, misunderstanding, inexactness, laxity, misconstruction, miscomputation, non sequitur, mis-statement, mis-report, mumpsimus, mistake, miss, fault, blunder, quiproquo, cross purposes, oversight, misprint, erratum, corrigendum, slip, blot, flaw, loose thread, trip, stumble, botchery, slip of the tongue, slip of the lip, Freudian slip, slip of the pen, lapsus linguae, clerical error, bull, haplography, illusion, delusion, snare, false impression, false idea, bubble, self-decit, self-deception, mists of error, heresy, hallucination, false light, dream, fable, bias, misleading, erroneous, untrue, false, devoid of truth, fallacious, apocryphal, unreal, ungrounded, groundless, unsubstantial, heretical, unsound, illogical, inexact, unexact inaccurate, incorrect, indefinite, illusive, illusory, delusive, mock, ideal, spurious, deceitful, perverted, controvertible, unsustainable, unauthenticated, untrustworthy, exploded, refuted, discarded, in error, under an error, mistaken, tripping, out, out in one's reckoning, aberrant, beside the mark, wide of the mark, wide of the truth, way off, far off, astray, on a false scent, on the wrong scent, in the wrong box, outside the ballpark, at cross purposes, all in the wrong, all out, more or less, errare est humanum, mentis gratissimus error, on the dubious waves of error tost, to err is human, to forgive divine, you lie -- under a mistake.