Fluctuating; being in doubt; undetermined; indecisive; uncertain; unsteady.(adjective)
Present participle of waver.(verb)
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Use "wavering" in a sentence
"Sarah was standing in the doorway, her expression wavering between revulsion and amazement."
"In the silence, staring at the green light on the stereo, she could almost hear how the song would end, with the single sustained note of the violin wavering over the fading guitar."
"She tried to make her voice sound calm and confident but instead it slid out in wavering, nervy tones."