Adjective : an ineffectual, vacillating person. ,a vacillating indicator.    From Dictionary.com. 

Be vacillant over those vigilant who would leave you to belave black on white.    From Wordnik.com.  [Finnegans Wake] Reference

"That ideal, like any other, can only be approached asymptotically, never reached; and I, being somewhat foolish and silly, as well as weak and vacillant, am much less perfect than most.".    From Wordnik.com.  [First Lensman]

Fasse autour d’un grand feu vacillant dans la chambre.    From Wordnik.com.  [Lorsque l'enfant paraît.…] Reference

And life became as easy to bear as a vacillant vision seen in dream.    From Wordnik.com.  [The Created Legend] Reference

He was at that time a weak and vacillant youth, given over to the same pleasures and vices which drove his father mad and caused his brother's death.    From Wordnik.com.  [Great Men and Famous Women. Vol. 5 of 8 A series of pen and pencil sketches of the lives of more than 200 of the most prominent personages in History] Reference

His look from behind the deceptive, vacillant shields was hot and evil; he poured out his dazzling light, tormented men with it, yet wished them to rejoice in his presence and to compose hymns to him.    From Wordnik.com.  [The Created Legend] Reference

With hands now as steady and sure as they had been vacillant a moment since, he closed the safe door noiselessly, shot its bolts, and was yards away, crouching behind an armchair, before the man outside had ceased to fumble with the window fastenings.    From Wordnik.com.  [The False Faces Further Adventures from the History of the Lone Wolf] Reference

He could by no means account for the light he seemed to see therein, a light that kindled while he watched like a tiny flame, feeble, fearful, vacillant, then as the moments passed steadied and grew stronger but ever leaped and danced; so that he, lost in the wonder of it and forgetful of himself, thought of it as the ardent face of a happy child dancing in the depths of some brown autumnal woodland.    From Wordnik.com.  [The Lone Wolf A Melodrama] Reference

Its "bulls," with their often audacious purchases of stock for which they do not pay but out of whose random fluctuations in value they expect to reap thousands from the "bears," who sell in a like blind, betting-ring fashion; its devices of "spreads," and of "straddles," which are combinations of "puts" and "calls" whereby the purchaser limits his loss and at the same time suits the chances of his winning to those of vacillant prices themselves; its unblushing compromises on the part of debtors with creditors, fifty cents on the dollar being frequently paid by bankrupts to the extent of one, two, or three hundred thousand dollars, in order that they may resume their highly legitimate undertakings and perhaps grow rich again in company with their fellow-gamblers; all these, and many more features of Wall.    From Wordnik.com.  [The Arena Volume 4, No. 24, November, 1891] Reference