1.AdjectiveRelating to, or existing as gas (matter in an intermediate state between liquid and plasma).
"gaseous state; gaseous emissions; gaseous substance; At room temperature, oxygen remains in a gaseous state.; The mixture produced a gaseous vapor when heated."
2.AdjectiveOf a liquid containing bubbles: gassy.
3.AdjectiveLacking substance or solidity; tenuous.
"Her gaseous explanations left everyone confused."