Source : Webster's Revised Unabridged Dictionary (1913)

Airless \Air"less\, a.
   Not open to a free current of air; wanting fresh air, or
   communication with the open air.

Source : WordNet®

airless
     adj : lacking fresh air; "a dusty airless attic"; "the dreadfully
           close atmosphere"; "hot and stuffy and the air was blue
           with smoke" [syn: {close}, {stuffy}, {unaired}]