In a way that lacks air or seems suffocating and without fresh movement or circulation.
From 'airless' (without air) + '-ly' (adverb suffix). 'Airless' comes from Old English 'æra' (air) + '-less' (without), combining to describe absence of air in the 15th century.
Airlessly describes that eerie feeling in sealed spaces—like submarines or airtight chambers where you can't breathe freely. Writers use this word to create tension, because humans instinctively fear spaces where air doesn't move.
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