fluctuate

verb

1. (intransitive)To vary irregularly; to swing.
2. (intransitive)To undulate.

   “One of them, at great Expence of Algebra, proves, that the Motes, which in Scotomias, we seem to have in our Eyes, are not real Bodies fluctuating in them.”

3. (intransitive)To be irresolute; to waver.

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

4. (transitive)To cause to vary irregularly.
5. (also, figuratively, literally, rare)To rise and fall as a wave; to be tossed up and down the waves.

adj

1. (obsolete)Tossed up and down the waves.
2. (broadly, obsolete)Wavering, fickle.