Definition of perturb verb from the Oxford Advanced Learner's Dictionary

 

perturb

 verb
verb
BrE BrE//pəˈtɜːb//
 
; NAmE NAmE//pərˈtɜːrb//
 
Verb Forms present simple I / you / we / they perturb
BrE BrE//pəˈtɜːb//
 
; NAmE NAmE//pərˈtɜːrb//
 
he / she / it perturbs
BrE BrE//pəˈtɜːbz//
 
; NAmE NAmE//pərˈtɜːrbz//
 
past simple perturbed
BrE BrE//ˈtɜːbd//
 
; NAmE NAmE//pərˈtɜːrbd//
 
past participle perturbed
BrE BrE//ˈtɜːbd//
 
; NAmE NAmE//pərˈtɜːrbd//
 
-ing form perturbing
BrE BrE//pəˈtɜːbɪŋ//
 
; NAmE NAmE//pərˈtɜːrbɪŋ//
 
 
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perturb somebody (formal) to make somebody worried or anxious synonym alarm Her sudden appearance did not seem to perturb him in the least. I was perturbed by his lack of interest. Word Origin late Middle English: from Old French pertourber, from Latin perturbare, from per- ‘completely’ + turbare ‘disturb’.
See the Oxford Advanced American Dictionary entry: perturb