Vacillate /(văs"ĭl*lāt)/

imp. & p. p. Vacillated; p. pr. & vb. n. Vacillating

1. To move one way and the other; to reel or stagger; to waver.

   [A spheroid] is always liable to shift and vacillatefrom one axis to another.

2. To fluctuate in mind or opinion; to be unsteady or inconstant; to waver.