insubstantially

In wispy fashion

In a way that lacks substance, solidity, or significance.

Something built insubstantially won't hold up; an argument made insubstantially lacks supporting evidence.

The word often describes things that seem flimsy or barely there: The curtains hung insubstantially in the draft, His claims were insubstantially supported.

flimsy

fragile

Easily broken or damaged

frangible · flimsy · diaphanous · gossamer · wispy · featherlight · gauzy · sheer · papery · threadbare

immaterial

ethereal

Delicate beyond earthly measure

incorporeal · intangible · spiritual · otherworldly · supernatural · wispy · vaporous · nebulous · ephemeral · airy

vague

nebulous

Unclear and formless

fuzzy · blurry · indefinite · ambiguous · obscure · imprecise · murky · cloudy · shadowy · formless

insignificant

trivial

Lacking significance or weight

petty · negligible · marginal · immaterial · unimportant · trifling · incidental · secondary · superficial · frivolous

meager

scant

Barely adequate amount

trifling · meager · slight · sparse · thin · nominal · skimpy · scanty · inadequate · insufficient

Opposites
physical solidity/materiality

insubstantiallysubstantially

To a significant degree

solidly · concretely · materially · tangibly · physically

significance/importance

insubstantiallysubstantially

To a significant degree

significantly · crucially · meaningfully · importantly · consequentially

stability/firmness

insubstantiallyfirmly

With steadfast resolve

solidly · robustly · sturdily · securely · strongly

Family

insubstantial

Familiarity
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Used worldwide · Timeless · Abstract · Everyday, not technical · Rated G