VACILLATE
fluctuate, vacillate, waver
(verb) move or sway in a rising and falling or wavelike pattern; “the line on the monitor vacillated”
hover, vibrate, vacillate, oscillate
(verb) be undecided about something; waver between conflicting positions or courses of action; “He oscillates between accepting the new position and retirement”
Source: WordNet® 3.1
Etymology
Verb
vacillate (third-person singular simple present vacillates, present participle vacillating, simple past and past participle vacillated)
(intransitive) To sway unsteadily from one side to the other; oscillate.
(intransitive) To swing indecisively from one course of action or opinion to another.
Synonyms
• (to sway from one side to the other): stagger
• (to swing indecisively): blow hot and cold, waffle
Anagrams
• cavatelli, laticlave
Source: Wiktionary
Vac"il*late, v. t. [imp. & p. p. Vacillated; p. pr. & vb. n.
Vacillating.] Etym: [L. vacillare, vacillatum; cf. Skr. vañc.]
1. To move one way and the other; to reel or stagger; to waver.
[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.
Source: Webster’s Unabridged Dictionary 1913 Edition