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impassive

[im-pas-iv] /ɪmˈpæs ɪv/
adjective
1.
without emotion; apathetic; unmoved.
2.
calm; serene.
3.
unconscious; insensible.
4.
not subject to suffering.
Origin
1660-1670
1660-70; im-2 + passive
Related forms
impassively, adverb
impassiveness, impassivity
[im-pa-siv-i-tee] /ˌɪm pæˈsɪv ɪ ti/ (Show IPA),
noun
Synonyms
1. emotionless, phlegmatic, stoical, indifferent, undisturbed, unperturbed. 2. tranquil, unruffled, composed. 4. unaffected; unflinching.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for impassive

impassive

/ɪmˈpæsɪv/
adjective
1.
not revealing or affected by emotion; reserved
2.
calm; serene; imperturbable
3.
(rare) unconscious or insensible
Derived Forms
impassively, adverb
impassiveness, impassivity (ˌɪmpæˈsɪvɪtɪ) noun
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for impassive
impassive
1660s, "not feeling pain," from in- (1) + passive. Meaning "void of emotions" is from 1690s.
Online Etymology Dictionary, © 2010 Douglas Harper
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