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imperturbable

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

1490–1500; < Late Latin imperturbābilis. See im-2, perturbable
Related formsim·per·turb·a·bil·i·ty, im·per·turb·a·ble·ness, nounim·per·turb·a·bly, adverb

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Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Related Words

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British Dictionary definitions for imperturbable

imperturbable

adjective
  1. not easily perturbed; calm; unruffled
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Derived Formsimperturbability or imperturbableness, nounimperturbably, adverbimperturbation (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

Word Origin and History for 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.

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Online Etymology Dictionary, © 2010 Douglas Harper