[A spheroid] is always liable to shift and vacillatefrom one axis to
another.
Paley.
2. To fluctuate in mind or opinion; to be unsteady or inconstant; to
waver.
Syn. — See Fluctuate.
Vac"il*la`ting (?), a. Inclined to fluctuate; wavering. Tennyson. —
Vac"il*la`ting*ly, adv.