1. filled with vapor

    e.g. miasmic jungles
           a vaporous bog

    Synonym: miasmalmiasmicvaporous

2. resembling or characteristic of vapor

    e.g. vaporous clouds

    Synonym: vaporificvapourificvaporishvapourishvaporous

3. so thin as to transmit light

    e.g. a hat with a diaphanous veil
           filmy wings of a moth
           gauzy clouds of dandelion down
           gossamer cobwebs
           sheer silk stockings
           transparent chiffon
           vaporous silks

    Synonym: diaphanousfilmygauzygauze-likegossamersee-throughsheertransparentvaporouscobwebby