to vacillate between choices; to fluctuate
to sway unsteadily to and fro; to reel
to quiver or flicker
wavering flames
to hesitate as if about to give way; to falter
to make a tremulous sound; to quaver
waverer noun
wavering noun and adj
waveringly adv
wavery adj
[Middle English waveren from Old Norse vafra to flicker]