waver

Move back and forth very rapidly.

Sway from side to side.

Pause or hold back in uncertainty or unwillingness.

Be unsure or weak.

Move hesitatingly, as if about to give way.

Give off unsteady sounds, alternating in amplitude or frequency.

Move or sway in a rising and falling or wavelike pattern.

Someone who communicates by waving.

The act of moving back and forth.

The act of pausing uncertainly.