Longman Dictionary of Contemporary English homepage

Date: 1500-1600
Language: Latin
Origin: , past participle of vacillare 'to move from side to side, fail to decide'

vacillate

 verb
     
vac‧il‧late [intransitive] formal
to continue to change your opinions, decisions, ideas etc [= waver]
vacillate between
Her parents vacillated between different approaches to discipline.
—vacillation noun [uncountable and countable]
Definition from the Longman Dictionary of Contemporary English
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