impassive
adjective
im·pas·sive
(ˌ)im-ˈpa-siv
1
: giving no sign of feeling or emotion : expressionless
2
a
: unsusceptible to or destitute of emotion : apathetic
b
: unsusceptible to physical feeling : insensible
c
archaic
: unsusceptible to pain
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Merriam-Webster unabridged
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