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imperturbable

[im-per-tur-buh-buh l] /ˌɪm pərˈtɜr bə bəl/
adjective
1.
incapable of being upset or agitated; not easily excited; calm:
imperturbable composure.
Origin
1490-1500
1490-1500; < Late Latin imperturbābilis. See im-2, perturbable
Related forms
imperturbability, imperturbableness, noun
imperturbably, adverb
Synonyms
composed, collected, impassive, cool, unmoved.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for imperturbably

imperturbable

/ˌɪmpɜːˈtɜːbəbəl/
adjective
1.
not easily perturbed; calm; unruffled
Derived Forms
imperturbability, imperturbableness, noun
imperturbably, adverb
imperturbation (ˌɪmpɜːtɜːˈbeɪʃən) 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 imperturbably

imperturbable

adj.

c.1500, from Middle French imperturbable and directly from Late Latin imperturbabilis "that cannot be disturbed" (Augustine), from assimilated form of in- "not, opposite of" (see in- (1)) + *perturbabilis, from Latin perturbare "to confuse, disturb" (see perturb). Related: Imperturbably; imperturbability.

Online Etymology Dictionary, © 2010 Douglas Harper
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