1 be or become unsteady; falter; begin to give way.
2 be irresolute or undecided between different courses or opinions; be shaken in resolution or belief.
3 (of a light) flicker.
Derivatives:
waverer n. waveringly adv.
Etymology: ME f. ON vafra flicker f. Gmc, rel. to WAVE
Useful english dictionary. 2012.