IMPERMEABLE

impermeable

(adjective) preventing especially liquids to pass or diffuse through; “impermeable stone”; “an impermeable layer of scum”; “a coat impermeable to rain”

Source: WordNet® 3.1

Etymology

Adjective

impermeable (comparative more impermeable, superlative most impermeable)

Impossible to permeate.

Not allowing passage, especially of liquids; waterproof.

Synonyms

• sealed

Antonyms

• permeable

Source: Wiktionary

Im*per"me*a*ble, a. Etym: [Pref. im- not + permeable: cf. F. imperméable, L. impermeabilis.]

Definition: Not permeable; not permitting passage, as of a fluid. through its substance; impervious; impenetrable; as, India rubber is impermeable to water and to air.

– Im*per"me*a*ble*ness, n.

– Im*per"me*a*bly, adv.

Source: Webster’s Unabridged Dictionary 1913 Edition