67 entries under adjective topic. ×

15
hermetic(verb, tight, proof, closed)
10
sealed(tight, proof, impervious, hermetic)
9
tight(proof, impervious, hermetic, sealed)
9
watertight(tight, proof, impervious, hermetic)
8
air-tight(tight, proof, impervious, hermetic)
7
closed(verb, closed, enclosed, sealed)
7
impermeable(tight, proof, impervious, impenetrable)
7
impervious(fast, short, tight, dense)
7
unassailable(certain, indisputable)
7
waterproof(water, tight, proof, impervious)
5
gas-tight(tight, proof, impervious, hermetic)
5
irrefutable(certain, indisputable)
4
airproof(tight, proof, impervious, hermetic)
4
hermetical(tight, proof, impervious, hermetic)
4
impenetrable
4
snug
3
certain(strong, sound, indisputable)
3
dampproof(tight, proof, impervious, hermetic)
3
fast
3
gastight(tight, proof, impervious, hermetic)
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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>