Synonyms|159Antonyms|47|Broader|4Narrower|4Related|240
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gruesomeness
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hardness
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hardship
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harshness
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impassable(adjective, dense, resistant, impervious, impenetrable)
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impermeable to air(expression, idiom)
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impervious to air(expression, idiom)
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lidded
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nonporous(adjective, dense, resistant, impervious, impenetrable)
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padlocked
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reclosable(adjective, tight, proof, impervious, hermetic)
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rigidity
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rigor
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rigorous
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rigorousness
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rigour
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seal
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sealed tight(expression, idiom)
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seals
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severity
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APASmart Define. (2015). airtight thesaurus. Retrieved September 26, 2026, from https://smartdefine.org/airtight/thesaurus/synonyms
ChicagoSmart Define. 2015. "airtight thesaurus" https://smartdefine.org/airtight/thesaurus/synonyms (accessed September 26, 2026).
HarvardSmart Define 2015, airtight thesaurus, Smart Define, viewed 26 September, 2026, <https://smartdefine.org/airtight/thesaurus/synonyms>.
MLASmart Define. "airtight thesaurus" 14 April 2015. Web. 26 September 2026. <https://smartdefine.org/airtight/thesaurus/synonyms>