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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 imperturbability
Historical Examples
  • We all looked at Mr. Blair, who gazed with imperturbability at Waters.

  • He gazed on us from behind the mask of his Indian imperturbability.

    The Forest Stewart Edward White
  • He was determined to break down the other's wall of imperturbability.

    The Grell Mystery Frank Froest
  • Nothing kept him in check save the imperturbability of the seated figure.

    Prairie Folks Hamlin Garland
  • Quasimodo had resumed, to all appearance, his first imperturbability.

    Notre-Dame de Paris Victor Hugo
  • His face had an almost African imperturbability, impassive, incomprehensible.

    The Rainbow D. H. (David Herbert) Lawrence
  • That, at all events, was evident to him, even in her imperturbability.

    Adrienne Toner Anne Douglas Sedgwick
  • I back a woman's wits against a statesman's imperturbability.

    Miss Hildreth, Volume 3 of 3 Augusta de Grasse Stevens
  • Sister forgot her imperturbability, gave a jump, and began to roar.

    Pelle the Conqueror, Complete Martin Anderson Nexo
  • His power seemed almost Napoleonic; his imperturbability was absolute.

    At The Sign Of The Eagle Gilbert Parker
British Dictionary definitions for imperturbability


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 imperturbability



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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