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Verb: vacillate  'va-su,leyt
  1. Be undecided about something; waver between conflicting positions or courses of action
    "He vacillates between accepting the new position and retirement";
    - hover, vibrate, oscillate, blow hot and cold [informal]
  2. Move or sway in a rising and falling or wavelike pattern
    "the line on the monitor vacillated";
    - fluctuate, waver

Derived forms: vacillates, vacillating, vacillated

Type of: balk, baulk [Brit], hesitate, swing, waffle [N. Amer, informal], waver