vacillating

动词 vacillate:

1. be undecided about something; waver between conflicting positions or courses of action
   同义词：hover, vibrate, vacillate, oscillate
2. move or sway in a rising and falling or wavelike pattern
   同义词：fluctuate, vacillate, waver

形容词 vacillating:

1. uncertain in purpose or action
   同义词：vacillant, wavering