vac·il·late 
(văsə-lāt′)
(văsə-lāt′)intr.v. vac·il·lat·ed, vac·il·lat·ing, vac·il·lates
1. To be unable to choose between different courses of action or opinions; waver: She vacillated about whether to leave.
2. To change between one state and another; fluctuate: The weather vacillated between sunny and rainy.
3. Archaic To sway from one side to the other.
[Latin vacillāre, vacillāt-, to waver.]
vacil·lat′ing·ly adv.
vac′il·lation n.
vacil·la′tor n.