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

 

vacillate

 verb
verb
BrE BrE//ˈvæsəleɪt//
 
; NAmE NAmE//ˈvæsəleɪt//
 
[intransitive](formal)Verb Forms present simple I / you / we / they vacillate
BrE BrE//ˈvæsəleɪt//
 
; NAmE NAmE//ˈvæsəleɪt//
 
he / she / it vacillates
BrE BrE//ˈvæsəleɪts//
 
; NAmE NAmE//ˈvæsəleɪts//
 
past simple vacillated
BrE BrE//ˈvæsəleɪtɪd//
 
; NAmE NAmE//ˈvæsəleɪtɪd//
 
past participle vacillated
BrE BrE//ˈvæsəleɪtɪd//
 
; NAmE NAmE//ˈvæsəleɪtɪd//
 
-ing form vacillating
BrE BrE//ˈvæsəleɪtɪŋ//
 
; NAmE NAmE//ˈvæsəleɪtɪŋ//
 
 
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to keep changing your opinion or thoughts about something, especially in a way that annoys other people synonym waver The country’s leaders are still vacillating between confrontation and compromise. Word Origin late 16th cent. (in the sense ‘sway unsteadily’): from Latin vacillat- ‘swayed’, from the verb vacillare.
See the Oxford Advanced American Dictionary entry: vacillate