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 To From  Perturb Disturb Verb Throw Perturbation Perturbed 

Title perturb
Text
Merriam-Webster's Collegiate Dictionary
per·turb
 \\pər-ˈtərb\\ transitive verb
 ETYMOLOGY  Middle English, from Middle French perturber,from Latin perturbare to throw into confusion, from per- + turbare to disturb — more at 
turbid
 DATE  14th century
1. to disturb greatly in mind : 
disquiet
2. to throw into confusion : 
disorder
3. to cause to experience a perturbation
Synonyms: see 
discompose
• per·turb·able 
 \\-ˈtər-bə-bəl\\ adjective
English Etymology
perturb
  late 14c. (implied in perturbation), probably via 
O.Fr
http://O.Fr
. perturber(14c.), from L. perturbare "to confuse, disorder, disturb," from per-"through" + turbare "disturb, confuse," from turba "turmoil, crowd" (see turbid).
Oxford Advanced Learner's Dictionary-牛津双解-OALD7
perturb
per·turb pE5tE:bNAmE pEr5tE:rb / verb[VN]
   (formal) to make sb worried or anxious
   使焦虑;使不安
   SYN  
alarm
 :
   Her sudden appearance did not seem to perturb him in the least. 
   她的突然出现似乎一点也没有令他不安。 
 per·turbed -5tE:bdNAmE -5tE:rbd / adj. ~ (at / about sth) 
   a perturbed young man 
   烦恼的年轻人 
   She didn't seem perturbed at the change of plan. 
   她对改变计划似乎毫不在意。 
   OPP  
unperturbed
Webster's Third New International Dictionary, Unabridged
per·turb
\pərˈtərb; pəˈtə̄b, -təib\ transitive verb
(-ed/-ing/-s)
Etymology: Middle English perturben, from Middle French perturber, from Latin perturbare, from per-, intensive prefix + turbare to throw into disorder, disturb, make turbid — more at 
per-
turbid
1. : to disturb considerably in mind : make quite uneasy : cause to be upset or worried or alarmed : 
disquiet
unsettle
 < was perturbed by the news >
 < had not expected this development and it rather perturbed him >
2. : to put into considerable disorder or confusion : throw out of kilter : 
derange
 perturbing good social order with their lies and propaganda >
3. 
 a. : to cause (a planet or other celestial body) to deviate from a theoretically regular orbital motion usually as a result of interposed or otherwise extraordinary gravitational pull
 b. : to disturb or interfere with or modify the usual or expected motion or course or arrangement of (as atoms)
  < interaction between a hydrogen atom perturbed by a passing ion — Physical Review >
4. : to subject to tonal perturbation
Synonyms: see 
discompose

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