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impermeably
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imperviously
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resistantly
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solidly
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waterproofly
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watertightly
13 years ago|43 views|share |citing 
APASmart Define. (2013). permeably thesaurus. Retrieved September 24, 2026, from https://smartdefine.org/permeably/thesaurus/antonyms
ChicagoSmart Define. 2013. "permeably thesaurus" https://smartdefine.org/permeably/thesaurus/antonyms (accessed September 24, 2026).
HarvardSmart Define 2013, permeably thesaurus, Smart Define, viewed 24 September, 2026, <https://smartdefine.org/permeably/thesaurus/antonyms>.
MLASmart Define. "permeably thesaurus" 18 May 2013. Web. 24 September 2026. <https://smartdefine.org/permeably/thesaurus/antonyms>