im·per·turb·a·ble

[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

im·per·turb·a·bil·i·ty, im·per·turb·a·ble·ness, noun
im·per·turb·a·bly, adverb


composed, collected, impassive, cool, unmoved.
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Based on the Random House Dictionary, © Random House, Inc. 2013.
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World English Dictionary
imperturbable (ˌɪmpɜːˈtɜːbəbəl) [Click for IPA pronunciation guide]
 
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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00:10
Imperturbable is a GRE word you need to know.
So is nostrum. Does it mean:
mournful, dismal, or gloomy, esp. in an affected, exaggerated, or unrelieved manner:
a medicine sold with false or exaggerated claims and with no demonstrable value; quack medicine.
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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