Gaseous

a.	1.	In the form, or of the nature, of gas, or of an aëriform fluid.
	2.	Lacking substance or solidity; tenuous.

Adj.

1.

gaseous - existing as or having characteristics of a gas; "steam is water is the gaseous state" Antonyms: liquid - existing as or having characteristics of a liquid; especially tending to flow; "water and milk and blood are liquid substances" solid - of definite shape and volume; firm; neither liquid nor gaseous; "ice is water in the solid state"

adulterated, aerial, aerodynamic, aerostatic, aery, air-built, airy, attenuate, attenuated, chimerical, cloud-built, cut, dilute, diluted, dreamlike, ethereal, fanciful, fatuitous, fatuous, fine, flimsy, fuming, fumy, gasified, gasiform, gaslike, gassy, gossamery, illusory, imaginary, insubstantial, mephitic, miasmal, miasmatic, miasmic, oxyacetylene, oxygenous, ozonic, phantomlike, pneumatic, rare, rarefied, reeking, reeky, shadowy, slight, smoking, smoky, spirituous, steaming, steamy, subtile, subtle, tenuous, thin, thinned, thinned-out, uncompact, uncompressed, unreal, unsubstantial, vaporing, vaporish, vaporlike, vaporous, vapory, watered, watered-down, windy