Changing location by moving back and forth. (noun)
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Use "vacillation" in a sentence
"What we call vacillation is to have no fixed opinion, to be influenced at once by the opinions of others."
"That's what I call vacillation, and you ought to be ashamed of it. ""
"This disposition of the mind, which arises from two contrary emotions, is called vacillation; it stands to the emotions in the same relation as doubt does to the imagination (II.xliv. note); vacillation and doubt do not differ one from the other, except as greater differs from less."