wavering

Concise Oxford English Dictionary © 2008 Oxford University Press:
waver/ˈweɪvə(r)/

▶verb

• 1 move quiveringly; flicker.

• 2 begin to weaken; falter.

  ■ be irresolute.

– derivatives
waverer noun,
wavering noun & adjective,
waveringly adverb,
wavery adjective.

– origin ME: from ON vafra ‘flicker’, of Gmc origin; cf. wave.