This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

• Lexulous
• Wordscraper
• Wordosaur

adj. Lacking substance or reality. See Synonyms at immaterial.

adj. Not firm or solid; flimsy.

adj. Delicate; fine.

adj. Negligible in size or amount.

adj. Lacking substance; not real or strong.

adj. Unsubstantial; not real or strong.

Unsubstantial.

adj. lacking material form or substance; unreal

adj. lacking in nutritive value

"Both start with an idea, something insubstantial, that is transformed into an artifact that can influence the world and other people."

stringy    wraithlike    shadowy    aeriform    airy    ethereal    aerial    aery    unwholesome   

substantial   

unsubstantial    immaterial   

circumstantial    financial    nonfinancial    substantial   

unsubstantial    intangible    ethereal    filmy    nebulous    unreal    impalpable    ephemeral    tenuous    ghostly