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

Collins English Dictionary - Complete & Unabridged 10th Edition
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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
Once again, the imperturbable transport secretary gave a smooth performance.
Some people are incurable contrarians or imperturbable logicians.
He curtsied low, and then bowed almost to the ground, with an imperturbable gravity that seemed almost suspicious.
In his own imperturbable firmness of character, my uncle had grown into the habit of never contradicting any one in conversation.
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