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[im-per-tur-buh-buh l] /ˌɪm pərˈtɜr bə bəl/
incapable of being upset or agitated; not easily excited; calm:
imperturbable composure.
Origin of imperturbable
1490-1500; < Late Latin imperturbābilis. See im-2, perturbable
Related forms
imperturbability, imperturbableness, noun
imperturbably, adverb
composed, collected, impassive, cool, unmoved. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2018.
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Examples from the Web for imperturbable
Contemporary Examples
Historical Examples
  • "Not now," said Phil, patting his shoulder, with imperturbable good-nature.

    Malbone Thomas Wentworth Higginson
  • Then the doctor had understood, though his face was so imperturbable!

    Ester Ried Yet Speaking Isabella Alden
  • "Oh, ay, and some more forpye," was the imperturbable response.

  • The Hebrew took up the scroll with imperturbable composure, "My child!"

    Leila, Complete Edward Bulwer-Lytton
  • "Me no care if you be Gubnor or not," replied the imperturbable African.

  • He has a curiously subtle brain, and I do not know any one so imperturbable as he is.

    Changing Winds

    St. John G. Ervine
  • He had recovered from the surprise of her coming and was again his imperturbable self.

    The Snare Rafael Sabatini
  • Her movements are slow and imperturbable, as if she had much time before her.

  • And in the great obscurity, imperturbable, it heard him say he "washed his hands of everything."

    The Rescue Joseph Conrad
British Dictionary definitions for imperturbable


not easily perturbed; calm; unruffled
Derived Forms
imperturbability, imperturbableness, noun
imperturbably, adverb
imperturbation (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
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Word Origin and History for imperturbable

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.

Online Etymology Dictionary, © 2010 Douglas Harper
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