This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

• Lexulous
• Wordscraper
• Wordosaur

adj. Having no air.

adj. Lacking fresh air; stuffy.

adj. Lacking movement of air; still.

adj. Lacking or being without air.

adj. Lacking air circulation.

adj. With air that is stale.

adj. Suffering from asphyxia.

adj. stifling; dead; lacking vitality or excitement

adj. Not open to a free current of air; wanting fresh air, or communication with the open air.

Not open to a free current of air; wanting fresh air or communication with open air.

Without air; devoid of atmosphere.

adj. lacking fresh air

"We’ve turned revelation into drudgery, shut ourselves in airless rooms, and covered over the windows."

unventilated   

airlessness   

careless    hairless   

lightless    windowless    dank    arid    weightless    cheerless    stuffy    claustrophobic    featureless    lifeless