impervious [adjective]: impenetrable; not capable of being influenced.
Example: We counseled the young men not to take the law into their own hands, but they were impervious to reason.
Related words: imperviously [adverb], imperviousness [noun]
Synonyms: airtight, hermetic, immune, impassable, impenetrable, impermeable, impregnable, inaccessible, invulnerable, resistant, sealed, tight, unaffected, unapproachable, watertight
Antonyms: accessible, assailable, open, penetrable, responsive, sensitive, susceptible, vulnerable
Tags: GRE
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