WordWeb Online

1. So thin as to transmit light
   "a hat with a vapoury veil";
   - diaphanous, filmy, gauzy, gauze-like, gossamer, see-through, sheer, transparent, vaporous, vapourous [Brit, non-standard], cobwebby, vapory [US]
    
2. Resembling or characteristic of vapour
   "vapoury clouds";
   - vaporific, vapourific [Brit, Cdn], vaporish [US], vapourish [Brit, Cdn], vaporous, vapourous [Brit, non-standard], vapory [US]
    
3. Filled with vapour
   - miasmal, miasmic, vaporous, vapourous [Brit, non-standard], vapory [US]
    
4. [Brit, Cdn, archaic] Splenetic; peevish
   - vapory [archaic]

See also: cloudy, gaseous, thin