WordWeb Online

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

See also: cloudy, gaseous, thin