VAPOUROUS
miasmal, miasmic, vaporous, vapourous
(adjective) filled with vapor; “miasmic jungles”; “a vaporous bog”
vaporific, vapourific, vaporish, vapourish, vaporous, vapourous
(adjective) resembling or characteristic of vapor; “vaporous clouds”
diaphanous, filmy, gauzy, gauze-like, gossamer, see-through, sheer, transparent, vaporous, vapourous, cobwebby
(adjective) 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”
Source: WordNet® 3.1
Etymology
Adjective
vapourous (comparative more vapourous, superlative most vapourous)
Alternative form of vaporous
Source: Wiktionary