wanken

verb
  1. To sway or stagger unsteadily, often due to weakness, dizziness, or imbalance, resulting in a wavering or unsteady movement. verb
    After standing in the heat for hours, he began to wanken and had to sit down.
    The old man wankens as he tries to walk across the uneven ground.
  2. To show signs of wavering or indecision, especially in confidence or resolve, often leading to hesitation or faltering in action. verb
    Her confidence wankens when faced with unexpected questions.
    The team's resolve wankens under the pressure of the upcoming match.