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impermeable
adjective
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How to pronounce impermeable:

Definition of impermeable:

impermeable (adjective):
impervious
(of a substance) not allowing fluid to pass through
not permitting passage (as of a fluid) through its substance
adjective. preventing especially liquids to pass or diffuse through.

Synonyms for impermeable:

close
compact
compressed
dense
hermetic
impassable
impassible
impenetrable
imperviable
impervious
impregnable
nonporous
resistant
retentive
solid
sturdy
substantial
thick
tight
water-resistant
waterproof
Other 4-syllable words

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