1
stiff
1
stormtight
1
substantial
1
tender
1
tightly sealed(adjective, tight, proof, impervious, hermetic)
1
totally enclosed(adjective, tight, proof, impervious, hermetic)
1
tough
1
unarguable
1
unbendable
1
untouchable
1
water-proof(adjective, tight, proof, impervious, hermetic)
1
water-repellant
1
water-resistant
1
water-tight(adjective, tight, proof, impervious, hermetic)
1
water proof(expression, idiom)
1
waterproofed
1
weatherly
1
windtight
0
abs
0
attestable
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>