Synonyms for Vacillating:

adj.

capricious (adjective)
wayward, fleeting, whimsical, changeable, flighty, random, sporadic, fluctuating, scatterbrained, impulsive, frivolous, erratic, volatile, fickle, capricious, fly-by-night, fitful, indecisive, fanciful, Flitting, arbitrary.
changeable (adjective)
unsteady, variable, transformable, convertible, fickle, inconstant, reformable, precarious, flexible, volatile, modifiable, restless, varying, unstable, alterable, shifting, versatile, Transposable, wavering, changeable, flighty, movable, adaptable, unreliable, changeful, mercurial, protean, mutable, Vicissitudinous, irresolute, adjustable, ever-changing, unsettled, fluid.
changing (adjective)
tentative, vibrating, unsure, shifting, hesitating, swaying, undecided, fluctuating, volatile, hesitant, inconstant, wavering, changeable, irresolute, uncertain, oscillating.
conflicting (adjective)
ambivalent.
cowardly (adjective)
weak, spineless.
fluctuating (adjective)
staggering, unsteady, tottering.
irresolute (adjective)
yellow, Flitting, unwilling, hesitant, inconsistent, irresponsible, undependable, uncertain, indecisive, double-minded, shy, unresolved, Shilly-shally, weak, erratic, unsure, dillydallying, fickle, changeable, fly-by-night, infirm, spineless, ambivalent, volatile, halfhearted, shrinking, undecided, tentative, irresolute, shifty, capricious, impulsive, watery, insipid.
not resolute (adjective)
indecisive, vacillant, unsettled.
oscillating (adjective)
fluctuating, zigzag, teeter-totter, vibrating, oscillating, alternating, Undulating, throbbing, pulsating, back and forth.
uncertain (adjective)
wavering.

n.

vacillating (noun)
irresolute, wavering, vacillant.

v.

changing (verb)
Modifying, Adapting, reforming, Modulating, setting, changing, Deviating, Transposing, fluctuating, Adjusting, Converting, Diversifying, transiting, Transfiguring, altering, Transforming, mutating.
doubting (verb)
doubting, questioning, disbelieving, Distrusting, Suspecting, wondering.
oscillating (verb)
pulsing, staggering, trembling, tottering, wobbling, swaying, Rocking, teeter-tottering, radiating, Wagging, Seesawing, beating, Bobbing, ticking.
procrastinating (verb)
hesitating, dawdling, lingering, Procrastinating, stalling, Dallying, dilly-dallying, Filibustering.

Other synonyms:

unreliable. Other relevant words:
alternating, vacillant, unreliable.

Usage examples for vacillating

  1. He had been weak and vacillating but when the test had come he had not been false either to himself or to his friends. – Paul and the Printing Press by Sara Ware Bassett
  2. " It is too late," said Isaura, with hollow tones, but with no trace of vacillating weakness on her brow and lips. – The Parisians, Book 11. by Edward Bulwer-Lytton
  3. Charles took " all men's opinions, but reserved his judgment," and acted on it, when matured, with irresistible energy; Philip was led by others, was vacillating in forming decisions, and irresolute in executing them when formed. – Project Gutenberg History of The Netherlands, 1555-1623, Complete by John Lothrop Motley