Impassive (adjective)
impassive [im-pas-iv]

adjective
1. without emotion; apathetic; unmoved.
2. calm; serene.
3. unconscious; insensible.
4. not subject to suffering.

Synonyms
1. emotionless, phlegmatic, stoical, indifferent, undisturbed, unperturbed.
2. tranquil, unruffled, composed.
4. unaffected; unflinching.

Origin: 1660-70; im- + passive

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