waver
noun.
someone who communicates by waving
noun.
the act of pausing uncertainly
there was a hesitation in his speech
noun.
the act of moving back and forth
Synonym: flicker, flutter
verb.
pause or hold back in uncertainty or unwillingness
Authorities hesitate to quote exact figures
Synonym: hesitate, waffle
verb.
be unsure or weak
Their enthusiasm is faltering
Synonym: falter
verb.
move hesitatingly, as if about to give way
Synonym: falter
verb.
move or sway in a rising and falling or wavelike pattern
the line on the monitor vacillated
verb.
move back and forth very rapidly
the candle flickered
verb.
sway from side to side
Synonym: weave
verb.
give off unsteady sounds, alternating in amplitude or frequency
Synonym: quaver