vaporous

Other forms: vaporously

Vaporous means foggy, or made of gas. On a misty morning, the cool, vaporous air by the sea might send you back home for a raincoat.

In science, this adjective is used for gases, including the vaporous water detected in the atmosphere of a distant planet, or the invisible swirl of vaporous wax that hovers above a lit candle. When the air feels vaporous, it's either foggy or extremely humid. Something that seems to lack real substance can also be described this way, like your vaporous plan to bike across the U.S., quickly abandoned as you realized how difficult it would be.

Definitions of vaporous

1. adjective

   resembling or characteristic of vapor
   “vaporous clouds”

   synonyms: vaporific, vaporish, vapourific, vapourish, vapourous

   gaseous

   existing as or having the qualities of a gas
2. adjective

   filled with vapor
   “a vaporous bog”

   synonyms: miasmal, miasmic, vapourous

   cloudy

   full of or covered with clouds
3. adjective

   so thin as to transmit light
   “vaporous silks”

   synonyms: cobwebby, diaphanous, filmy, gauze-like, gauzy, gossamer, see-through, sheer, transparent, vapourous

   thin

   of relatively small extent from one surface to the opposite or in cross section