be undecided about something; waver between conflicting positions or courses of action; "He oscillates between accepting the new position and retirement"
If you vacillate between two alternatives or choices, you keep changing your mind. She vacillates between men twice her age and men younger than she We cannot vacillate on the question of the party's leadership. to continue to change your opinions, decisions, ideas etc = waver vacillate between (past participle of vacillare )