impervious

[im-pur-vee-uhs] / ɪmˈpɜr vi əs /

ADJECTIVE

unable to be penetrated

Synonyms

STRONGEST

immune impassable impenetrable inaccessible invulnerable resistant unaffected unmoved

STRONG

imperviable

WEAK

closed to hermetic impassive impermeable sealed tight unapproachable unpierceable unreceptive watertight

Antonyms

STRONGEST

affected moved susceptible

WEAK

exposed open penetrable responsive sensitive vulnerable

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

In recent weeks, Hezbollah has increasingly relied on fiber-optic drones — which are both low-cost and impervious to jamming — to harass Israeli positions.

From Los Angeles Times • May 26, 2026

The cable makes the drone impervious to electronic jamming.

From The Wall Street Journal • May 1, 2026

Recent raids may try to instill fear, but this special communal space feels impervious to such weak displays.

From Los Angeles Times • Mar. 13, 2026

Throughout much of the Midwest thousands of acres of fine orchards were destroyed by insects now impervious to spraying.

From "Silent Spring" by Rachel Carson

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