"vapourous" in the adjective sense
1. diaphanous, filmy, gauzy, gauze-like, gossamer, see-through, sheer, transparent, vaporous, vapourous, cobwebby
so thin as to transmit light
"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"
2. vaporific, vapourific, vaporish, vapourish, vaporous, vapourous
resembling or characteristic of vapor
"vaporous clouds"
3. miasmal, miasmic, vaporous, vapourous
filled with vapor
"miasmic jungles"
"a vaporous bog"
Source: WordNet® (An amazing lexical database of English)
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