15
close(adjective, open, warm, hot, stale)
14
stuffy(adjective, close, open, warm, hot)
12
stifling(adjective, open, warm, hot, tight)
10
oppressive(adjective, warm, hot, tight, stale)
9
unventilated(adjective, warm, hot, tight, stale)
8
breathless(adjective, warm, hot, tight, stale)
7
suffocating(adjective, warm, hot, tight, stale)
5
musty(adjective, warm, tight, stale, rotten)
5
stale(adjective, warm, tight, rotten, musty)
5
unaired
5
windless(adjective, calm, still, breath)
4
breezeless(adjective, calm, still, breath)
4
still(adjective, calm, breath)
4
sultry(adjective, warm, hot, tight, stale)
3
muggy(adjective, warm, hot, tight, stale)
2
confining
2
frowsty
2
fuggy
2
fusty(adjective, warm, tight, stale, musty)
2
heavy(adjective, warm, hot, tight, stale)
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APASmart Define. (2015). airless thesaurus. Retrieved September 20, 2026, from https://smartdefine.org/airless/thesaurus/synonyms
ChicagoSmart Define. 2015. "airless thesaurus" https://smartdefine.org/airless/thesaurus/synonyms (accessed September 20, 2026).
HarvardSmart Define 2015, airless thesaurus, Smart Define, viewed 20 September, 2026, <https://smartdefine.org/airless/thesaurus/synonyms>.
MLASmart Define. "airless thesaurus" 14 April 2015. Web. 20 September 2026. <https://smartdefine.org/airless/thesaurus/synonyms>