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English definition of “vacillate”

vacillate

verb [I] uk   /ˈvæs.ɪ.leɪt/ disapproving us  
to be uncertain what to do, or to change often between two opinions: Her mood vacillated between hope and despair.Doubt and ambivalenceHesitating
vacillation
noun [C or U] uk   /ˌvæs.ɪˈleɪ.ʃən/ us  
Doubt and ambivalenceHesitating
(Definition of vacillate from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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