History
History
History
UK
US
Meaning:

(of materials) not allowing water etc to pass through; (of a person) not moved or influenced (by something)

unable to be penetrated

immune impassable impenetrable inaccessible invulnerable resistant unaffected unmoved imperviable closed to hermetic impassive impermeable sealed tight unapproachable unpierceable unreceptive watertight
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IMPERVIOUS as in Wiktionary
IMPERVIOUS as in Wikipedia