fluctuate

verb

1. To vary irregularly; to swing.

2. To undulate.

3. To be irresolute; to waver.

   “I fluctuated between wishing he was back home and wishing I'd never met him.”

4. To cause to vary irregularly.

5. Cause to fluctuate or move in a wavelike pattern

6. Move or sway in a rising and falling or wavelike pattern

   “the line on the monitor vacillated”

   Similar: vacillate, waver

7. Be unstable

   “The stock market fluctuates”