Vaporous /(vā"pẽr*ŭs`)/

Va·por·ous

Vaporous

a.
  1. Having the form or nature of vapor.
  2. Full of vapors or exhalations.
    The warmer and more vaporous air of the valleys.
    — Derham.
  3. Producing vapors; hence, windy; flatulent.
    The food which is most vaporous and perspirable is the most easily digested.
  4. Unreal; unsubstantial; vain; whimsical.
    Such vaporous speculations were inevitable.