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Definition of perturb verb from the Oxford Advanced American Dictionary

 

perturb

 verb
verb
NAmE//pərˈtərb//
 
perturb somebody (formal)Verb Forms present simple I / you / we / they perturb
 
he / she / it perturbs
 
past simple perturbed
 
-ing form perturbing
 
 
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to make someone 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.
 
adjective a perturbed young man perturbed at/about something She didn't seem perturbed at the change of plan. opposite unperturbed
See perturb in the Oxford Advanced Learner's Dictionary