waver - noun

someone who communicates by waving

the act of pausing uncertainly

the act of moving back and forth

waver - verb

• pause or hold back in uncertainty or unwillingness
• be unsure or weak
• move hesitatingly, as if about to give way
• move or sway in a rising and falling or wavelike pattern
• move back and forth very rapidly
• sway to and fro
• give off unsteady sounds, alternating in amplitude or frequency

waver - thesaurus

falter   faltering   flicker   flitter   fluctuate   flutter   hesitate   hesitation   quaver   quiver   vacillate   waffle   weave