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adjective
impervious
antonyms
pervious
related terms
impermeable
similar terms
acid-fast
colorfast
corrosion-resistant
fast
greaseproof
ladder-proof
moth-resistant
mothproof
proof
resistant
rot-resistant
run-resistant
runproof
soundproof
sounds kind of like
improbable
improbably
improvable
inoperable
invariable