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perturb

[per-turb]
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verb (used with object)
  1. to disturb or disquiet greatly in mind; agitate.
  2. to throw into great disorder; derange.
  3. Astronomy. to cause perturbation in the orbit of (a celestial body).

Origin of perturb

1325–75; Middle English perturben (< Old French perturber) < Latin perturbāre to throw into confusion, equivalent to per- per- + turbāre to disturb; see turbid
Related formsper·turb·a·ble, adjectiveper·turb·a·bil·i·ty, nounper·tur·ba·tious [pur-ter-bey-shuh s] /ˌpɜr tərˈbeɪ ʃəs/, adjectiveper·turb·ed·ly [per-tur-bid-lee] /pərˈtɜr bɪd li/, adverbper·turb·ed·ness, nounper·turb·er, per·tur·ba·tor [pur-ter-bey-ter] /ˈpɜr tərˌbeɪ tər/, nounper·turb·ing·ly, adverbper·turb·ment, nounnon·per·turb·a·ble, adjectivenon·per·turb·ing, adjectiveun·per·turb·a·ble, adjectiveun·per·turbed, adjectiveun·per·turb·ing, adjective

Synonyms

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1. trouble. 2. confuse, addle, muddle.

Antonyms

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

Examples from the Web for unperturbed

Contemporary Examples

Historical Examples

  • During the return journey his mind was quite calm and unperturbed.

    Mary Gray

    Katharine Tynan

  • "I mean it won't be amusing for others," said Nick, unperturbed by this levity.

    The Tragic Muse

    Henry James

  • After that meeting Macey was unperturbed, but Evans was a deeply worried man.

    The Galaxy Primes

    Edward Elmer Smith

  • "There's gun-men and gun-men," said Cherry Bim, unperturbed by the patent sarcasm.

  • “‘They that have no invention should be hanged,’” quoted Peggy, unperturbed.

    About Peggy Saville

    Mrs. G. de Horne Vaizey


British Dictionary definitions for unperturbed

unperturbed

adjective
  1. not disturbed or troubledunperturbed by the prospect of a fight

perturb

verb (tr; often passive)
  1. to disturb the composure of; trouble
  2. to throw into disorder
  3. physics astronomy to cause (a planet, electron, etc) to undergo a perturbation
Derived Formsperturbable, adjectiveperturbably, adverbperturbing, adjectiveperturbingly, adverb

Word Origin

C14: from Old French pertourber, from Latin perturbāre to confuse, from per- (intensive) + turbāre to agitate, from turba confusion
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 unperturbed

adj.

early 15c., from un- (1) "not" + past participle of perturb.

perturb

v.

late 14c., from Old French perturber "disturb, confuse" (14c.) and directly from Latin perturbare "to confuse, disorder, disturb," especially of states of the mind, from per- "through" (see per) + turbare "disturb, confuse," from turba "turmoil, crowd" (see turbid). Related: Perturbed; perturbing.

Online Etymology Dictionary, © 2010 Douglas Harper