follow Dictionary.com

Get our exclusive Word of the Day images!

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
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. 2014.
Cite This Source
Examples from the web for unperturbed
  • He had the rare gift of knowing how to be at once troubled and unperturbed.
  • unperturbed by native cells, immune fighters roar into action when viruses or other foreigners infiltrate the body.
  • In addition, he has seemed completely unperturbed by this apparent lack of originality.
  • People running the magazine should continue unperturbed.
  • Yet they seem to think that this invalid of an economy would be unperturbed by the risk of a default on our debts.
  • She might once have glided on unperturbed in this land of the bicycle.
  • They often seem unperturbed by people, especially when tempted by a feast and not chased by dogs or guns.
  • One stares directly at the camera, looking unperturbed by the flies on its face.
  • Some aspects of copyright law are, in fact, unperturbed by the rise of electronic media.
  • Up to now, though, those who want to smoke have puffed on unperturbed.
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
Cite This Source
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
Cite This Source

Word of the Day

Difficulty index for perturb

Few English speakers likely know this word

Word Value for unperturbed

16
0
Scrabble Words With Friends

Quotes with unperturbed

Nearby words for unperturbed