unsubstantial (adj.)

• adulterated
• airy
• apparent
• apparitional
• astral
• attenuate
• attenuated
• autistic
• bodiless
• breakable
• brittle
• chimeric
• cobwebby
• crumbly
• cut
• dainty
• dangerous
• deceptive
• decrepit
• delicate
• delusional
• delusive
• delusory
• desultory
• dilute
• diluted
• disembodied
• dreamlike
• dreamy
• effeminate
• erroneous
• ethereal
• fallacious
• false
• fanciful
• fantastic
• feeble
• fine
• flimsy
• fragile
• frail
• frangible
• gaseous
• ghostly
• gimcrack
• hazardous
• illusional
• illusionary
• illusive
• illusory
• imaginary
• immaterial
• impalpable
• imponderable
• improbable
• inconceivable
• inconclusive
• incorporate
• incorporeal
• incredible
• infirm
• insecure
• insubstantial
• intangible
• jerry-built
• light
• lightweight
• metaphysical
• misleading
• namby-pamby
• nonmaterial
• nonphysical
• occult
• ostensible
• otherworldly
• papery
• perilous
• phantasmagoric
• phantasmal
• phantom
• poor
• precarious
• provisional
• psychic
• puny
• rare
• rarefied
• risky
• rotten
• seeming
• shadowy
• shaky
• shifting
• shifty
• sissified
• sleazy
• slight
• slippery
• specious
• spectral
• spiritual
• subtle
• supernatural
• supposititious
• tacky
• temporary
• tentative
• tenuous
• thick
• thin
• thinned
• ticklish
• transmundane
• treacherous
• unbelievable
• unconvincing
• undependable
• unearthly
• unembodied
• unextended
• unfirm
• unfounded
• unproved
• unreal
• unrealistic
• unreliable
• unsound
• unstable
• unsteady
• unsure
• untrustworthy
• unworldly
• vaporous
• visionary
• watered
• weak
• weakly
• weightless
• windy
• wispy
• womanish