waver in WordNet English dictionary

1. the act of pausing uncertainly
   "there was a hesitation in his speech"
   hesitation  waver  falter  faltering 
   
2. the act of moving back and forth
   waver  flutter  flicker 
   
3. someone who communicates by waving
   waver 
   

1. move hesitatingly, as if about to give way
   falter  waver 
   
2. be unsure or weak
   "Their enthusiasm is faltering"
   falter  waver 
   
3. move back and forth very rapidly
   "the candle flickered"
   flicker  waver  flitter  flutter  quiver 
   
4. move or sway in a rising and falling or wavelike pattern
   "the line on the monitor vacillated"
   fluctuate  vacillate  waver 
   
5. pause or hold back in uncertainty or unwillingness
   "Authorities hesitate to quote exact figures"
   hesitate  waver  waffle 
   
6. give off unsteady sounds, alternating in amplitude or frequency
   quaver  waver 
   
7. sway to and fro
   waver  weave