per·turb

[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

per·turb·a·ble, adjective
per·turb·a·bil·i·ty, noun
per·tur·ba·tious [pur-ter-bey-shuhs] , adjective
per·turb·ed·ly [per-tur-bid-lee] , adverb
per·turb·ed·ness, noun
per·turb·er, per·tur·ba·tor [pur-ter-bey-ter] , noun
per·turb·ing·ly, adverb
per·turb·ment, noun
non·per·turb·a·ble, adjective
non·per·turb·ing, adjective
un·per·turb·a·ble, adjective
un·per·turbed, adjective
un·per·turb·ing, adjective


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


1. pacify.
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Based on the Random House Dictionary, © Random House, Inc. 2013.
Cite This Source Link To unperturbed
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Unperturbed is always a great word to know.
So is quincunx. Does it mean:
an arrangement of five objects, as trees, in a square or rectangle, one at each corner and one in the middle.
a calculus or concretion found in the stomach or intestines of certain animals, esp. ruminants, formerly reputed to be an effective remedy for poison.
Collins
World English Dictionary
perturb (pəˈtɜːb) [Click for IPA pronunciation guide]
 
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) [Click for IPA pronunciation guide]
 
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
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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
They were unperturbed as a dozen cameras clicked away beneath our pop-up roof.
In addition, he has seemed completely unperturbed by this apparent lack of
  originality.
One stares directly at the camera, looking unperturbed by the flies on its face.
Yet they seem to think that this invalid of an economy would be unperturbed by
  the risk of a default on our debts.
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