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Pronunciation varies by accent · noun
The state or condition of being poorly ventilated; lacking good air circulation, having stale air..
Use airlessness when its meaning, tone and grammar fit the full sentence. A synonym is not always a direct replacement.
Airlessness means The state or condition of being poorly ventilated; lacking good air circulation, having stale air..
The closest synonym depends on the sentence and intended sense.
The opposite depends on the specific sense.
Use airlessness where its definition matches the intended context.
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