0
brassbound
0
caulked
0
close-fitting
0
closed to(expression, unaffected, unyielding, unbending, resistant)
0
damp proof(expression, idiom)
0
falters
0
faultless
0
fixed
0
galeproof
0
good eye
0
ideal
0
ideally
0
immune(unaffected, unyielding, unbending, resistant, unreceptive)
0
impassive(unaffected, unyielding, unbending, resistant, unreceptive)
0
imperviable(unaffected, unyielding, unbending, resistant, unreceptive)
0
inaccessible(unaffected, unyielding, unbending, resistant, unreceptive)
0
incapable of leaking(expression, idiom)
0
indisputable
0
leak-proof
0
long-lasting
11 years ago|4.7k views|share |citing 
APASmart Define. (2015). watertight thesaurus. Retrieved September 27, 2026, from https://smartdefine.org/watertight/thesaurus/synonyms
ChicagoSmart Define. 2015. "watertight thesaurus" https://smartdefine.org/watertight/thesaurus/synonyms (accessed September 27, 2026).
HarvardSmart Define 2015, watertight thesaurus, Smart Define, viewed 27 September, 2026, <https://smartdefine.org/watertight/thesaurus/synonyms>.
MLASmart Define. "watertight thesaurus" 13 April 2015. Web. 27 September 2026. <https://smartdefine.org/watertight/thesaurus/synonyms>