imperturbable

[im-per-tur-buh-buhl]
adjective
incapable of being upset or agitated; not easily excited; calm: imperturbable composure.

Origin:
1490–1500; < Late Latin imperturbābilis. See im-2, perturbable

imperturbability, imperturbableness, noun
imperturbably, adverb


composed, collected, impassive, cool, unmoved.
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World English Dictionary
imperturbable (ˌɪmpɜːˈtɜːbəbəl)
 
adj
not easily perturbed; calm; unruffled
 
imperturba'bility
 
n
 
imper'turbableness
 
n
 
imper'turbably
 
adv
 
imperturbation
 
n

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Etymonline
Word Origin & History

imperturbable
mid-15c., from L.L. imperturbabilis "that cannot be disturbed" (Augustine), from in- "not" + *perturbabilis, from L. perturbare "to confuse, disturb" (see perturb).
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
What suggestions of imperturbability and being, as against the human trait of mere seeming.
Manliness is expressed through emotional coolness, ruthlessness, and imperturbability at any depravity.
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