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See more synonyms for imperturbable on Thesaurus.com
  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

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Examples from the Web for imperturbably

Historical Examples

  • Christian was steadily cheerful that morning, imperturbably practical.

    The Slave Of The Lamp

    Henry Seton Merriman

  • "Be patient; the time will come," Jean imperturbably replied.

    The Downfall

    Emile Zola

  • Peter tried to find the speakers with his gaze for a moment and then went on imperturbably.

    The Vagrant Duke

    George Gibbs

  • "I did the best for you and the Company," said Makola, imperturbably.

    Tales of Unrest

    Joseph Conrad

  • "This is true in every particular," said Croustillac imperturbably.

British Dictionary definitions for imperturbably


  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 imperturbably



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