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What is another word for impermeable?

Need synonyms for impermeable? Here's a list of similar words from our thesaurus that you can use instead.

Adjective
Not allowing passage, typically fluid or gas
“The precipitate clogs the openings, eventually forming an impermeable seal.”
Adjective
Impossible to penetrate or pass through
“The Court has constructed an impermeable wall of separation between church and state.”
Adjective
Consisting of matter all through
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Adjective
Resisting water etc
Adjective
Incapable of being passed through
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