gaseous

gaseous
    adj 1: existing as or having characteristics of a gas; "steam is
           water is the gaseous state" [ant: {liquid}, {solid}]
    

Gaseous \Gas"e*ous\ (? or ?; 277), a. [From {Gas}. Cf. F.
   gazeux.]
   1. In the form, or of the nature, of gas, or of an
      a["e]riform fluid.
      [1913 Webster]

   2. Lacking substance or solidity; tenuous. "Unconnected,
      gaseous information." --Sir J. Stephen.
      [1913 Webster]
    

69 Moby Thesaurus words for "gaseous":
      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