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.
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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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

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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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).

perturbed
1510s, pp. adj. from perturb.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
But the fees perturbed publishers, several of which are still owed money.
It's also hard not to be perturbed by the whole affair.
Then suddenly the police pursuers pause in the hot chase, distracted and
  perturbed by new things in view.
My dad, perturbed, asked the fellow why he had bothered asking.
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