Liable to vacillate; wavering, irresolute.(adjective)
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Use "vacillating" in a sentence
"Again, he is often loose and vacillating in the use of the English words he has selected as corresponding to the technical phraseology of the Arabian jurists, and sometimes infelicitous in the selection of his English terms."
"My friend, who may mildly be described as vacillating in temperament, left me in Calcutta."
"I think that there's a lot of us out there who are kind of vacillating in terms of 60-40 a lot in my own mind."