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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).
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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
British Dictionary definitions for perturbable

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
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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 perturbable

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.

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Online Etymology Dictionary, © 2010 Douglas Harper