4
impervious(adjective, watertight)
4
waterproof(adjective, watertight)
4
watertight
3
tight
1
airtight
1
ballproof
1
bombproof
1
bulletproof
1
burglarproof
1
corrosionproof
1
dampproof
1
dripproof
1
fire-resisting
1
fireproof
1
flameproof
1
floodproof
1
foolproof
1
hermetic
1
holeproof
1
impervious to
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APASmart Define. (2015). leakproof thesaurus. Retrieved September 21, 2026, from https://smartdefine.org/leakproof/thesaurus/synonyms
ChicagoSmart Define. 2015. "leakproof thesaurus" https://smartdefine.org/leakproof/thesaurus/synonyms (accessed September 21, 2026).
HarvardSmart Define 2015, leakproof thesaurus, Smart Define, viewed 21 September, 2026, <https://smartdefine.org/leakproof/thesaurus/synonyms>.
MLASmart Define. "leakproof thesaurus" 14 April 2015. Web. 21 September 2026. <https://smartdefine.org/leakproof/thesaurus/synonyms>