D defs.my
Entry 1 sense Webster, 1913

Impassive

/ĭmˌ-păs'-ĭv/ · Im·pas·sive · IPA /ɪmˈpæsɪv/
01 a. Not susceptible of pain or suffering; apathetic; impassible; unmoved.
  1. 1.
    Not susceptible of pain or suffering; apathetic; impassible; unmoved.
    Impassive as the marble in the quarry.” De Quincey.
    “On the impassive ice the lightings play.” Pope.