Webster's English Dictionary

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vaporous

va.por.ous \'va--p(*-)r*s\ aj 1: consisting or characteristic of vapor  2: 
   producing vapors : VOLATILE  3: containing or obscured by vapors : MISTY  
   4a: ETHEREAL, UNSUBSTANTIAL  4b: consisting of or indulging in high flown 
   expressions  - va.por.ous.ly av