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air tight(idiom, closure)
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hermetically sealed(idiom, closure)
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not ventilated
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water tight(idiom, closure)
11 years ago|2k views|share |citing 
APASmart Define. (2015). unventilated thesaurus. Retrieved September 21, 2026, from https://smartdefine.org/unventilated/thesaurus/synonyms
ChicagoSmart Define. 2015. "unventilated thesaurus" https://smartdefine.org/unventilated/thesaurus/synonyms (accessed September 21, 2026).
HarvardSmart Define 2015, unventilated thesaurus, Smart Define, viewed 21 September, 2026, <https://smartdefine.org/unventilated/thesaurus/synonyms>.
MLASmart Define. "unventilated thesaurus" 14 April 2015. Web. 21 September 2026. <https://smartdefine.org/unventilated/thesaurus/synonyms>