waver

someone who communicates by waving

the act of pausing uncertainly; "there was a hesitation in his speech"

the act of moving back and forth

pause or hold back in uncertainty or unwillingness; "Authorities hesitate to quote exact figures"

be unsure or weak; "Their enthusiasm is faltering"

move hesitatingly, as if about to give way

move or sway in a rising and falling or wavelike pattern; "the line on the monitor vacillated"

move back and forth very rapidly; "the candle flickered"

sway to and fro

give off unsteady sounds, alternating in amplitude or frequency