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perturb

[per-turb] /pərˈtɜrb/
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
1325-1375
1325-75; Middle English perturben (< Old French perturber) < Latin perturbāre to throw into confusion, equivalent to per- per- + turbāre to disturb; see turbid
Related forms
perturbable, adjective
perturbability, noun
perturbatious
[pur-ter-bey-shuh s] /ˌpɜr tərˈbeɪ ʃəs/ (Show IPA),
adjective
perturbedly
[per-tur-bid-lee] /pərˈtɜr bɪd li/ (Show IPA),
adverb
perturbedness, noun
perturber, perturbator
[pur-ter-bey-ter] /ˈpɜr tərˌbeɪ tər/ (Show IPA),
noun
perturbingly, adverb
perturbment, noun
nonperturbable, adjective
nonperturbing, adjective
unperturbable, adjective
unperturbed, adjective
unperturbing, adjective
Synonyms
1. trouble. 2. confuse, addle, muddle.
Antonyms
1. pacify.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the Web for unperturbed
Contemporary Examples
Historical Examples
  • The bar-keeper, unperturbed by this rejection, called into the tube behind him, "One Welsh rabbit."

    A Modern Instance William Dean Howells
  • During the return journey his mind was quite calm and unperturbed.

    Mary Gray Katharine Tynan
  • She met him perhaps less directly, but she met him unperturbed.

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

    The Tragic Muse Henry James
  • Both young men stared—but staring was a man's prerogative in Italy and Maria Angelina was unperturbed.

    The Innocent Adventuress Mary Hastings Bradley
  • "There's gun-men and gun-men," said Cherry Bim, unperturbed by the patent sarcasm.

    The Book of All-Power Edgar Wallace
  • He was unperturbed at standing alone against almost the entire nation.

    Romain Rolland Stefan Zweig
British Dictionary definitions for unperturbed

unperturbed

/ˌʌnpəˈtɜːbd/
adjective
1.
not disturbed or troubled: unperturbed by the prospect of a fight

perturb

/pəˈtɜːb/
verb (transitive; 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 Forms
perturbable, adjective
perturbably, adverb
perturbing, adjective
perturbingly, 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
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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
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