To Waver

1. (intransitive) To sway back and forth; to totter or reel.
2. (intransitive) To flicker, glimmer, quiver, as a weak light.
3. (intransitive) To fluctuate or vary, as commodity prices or a poorly sustained musical pitch.
4. (intransitive) To shake or tremble, as the hands or voice.
5. (intransitive) To falter; become unsteady; begin to fail or give way.
6. (intransitive) To be indecisive between choices; to feel or show doubt or indecision; to vacillate.