perturb

[per-turb]
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:
1325–75; Middle English perturben (< Old French perturber) < Latin perturbāre to throw into confusion, equivalent to per- per- + turbāre to disturb; see turbid

perturbable, adjective
perturbability, noun
perturbatious [pur-ter-bey-shuhs] , adjective
perturbedly [per-tur-bid-lee] , adverb
perturbedness, noun
perturber, perturbator [pur-ter-bey-ter] , noun
perturbingly, adverb
perturbment, noun
nonperturbable, adjective
nonperturbing, adjective
unperturbable, adjective
unperturbed, adjective
unperturbing, adjective


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


1. pacify.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
Cite This Source Link To unperturbed
Collins
World English Dictionary
perturb (pəˈtɜːb)
 
vb
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
 
[C14: from Old French pertourber, from Latin perturbāre to confuse, from per- (intensive) + turbāre to agitate, from turba confusion]
 
per'turbable
 
adj
 
per'turbably
 
adv
 
per'turbing
 
adj
 
per'turbingly
 
adv

unperturbed (ˌʌnpəˈtɜːbd)
 
adj
not disturbed or troubled: unperturbed by the prospect of a fight

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Etymonline
Word Origin & History

perturb
late 14c. (implied in perturbation), probably via O.Fr. perturber (14c.), from L. perturbare "to confuse, disorder, disturb," from per- "through" + turbare "disturb, confuse," from turba "turmoil, crowd" (see turbid).

unperturbed
early 15c., from un- (1) "not" + pp. of perturb.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
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.
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