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    Impervious

    /ɪmˈpɜːrviəs/

    Meaning & Definition

    adjective
    Not able to be affected by something.
    The new coating on the roof is impervious to rain.
    Not allowing fluid to pass through; waterproof.
    The impervious membrane kept the water from seeping inside.
    Impenetrable; unable to be passed or entered.
    His fierce demeanor made him impervious to criticism.
    Incapable of being influenced or affected.
    She appeared impervious to the stress of her job.

    Etymology

    Latin 'impervius', from 'in-' meaning 'not' and 'pervius' meaning 'passable'.

    Common Phrases and Expressions

    impervious to criticism:
    Unwilling or unable to be swayed by negative feedback.
    impervious surface:
    A surface that does not allow water to penetrate.
    impervious barrier:
    A barrier that prevents any passage or entry.

    Related Words

    impassable
    Not able to be passed or crossed.
    unresponsive
    Not reacting or responding to stimuli.
    resilient
    Able to withstand or recover quickly from difficult conditions.

    Slang Meanings

    Tough as nails.
    That guy is tough as nails; he's completely impervious to pain.
    Rock solid.
    Her confidence is rock solid; she's impervious to doubt.