Other Words for Insubstantial
Insubstantial as a Adjective has these synonyms:
illusory, unreal, illusive, imaginary, imagined, fanciful, fancied, visionary, immaterial, intangible, impalpable, incorporeal, airy, ethereal, spiritual, chimerical, phantom, phantasmal, phantasmagorical, hallucinatory, fantastic, false
Example: Through the mist London seemed insubstantial, a dream city of vapours rising from the Thames.
unsubstantial, insignificant, meager, diaphanous, small, flimsy, frail, weak, feeble, paltry, puny, slight, thin, tenuous, fragile, light, gossamer, wispy, wisp-like, fine
Example: Though the spider's thread appears insubstantial, for its weight it is enormously strong.