My courage and my resolution is firm; but my hopes fluctuate, and my spirits are often depressed.
My application was at first fluctuating and uncertain; it gained strength as I proceeded and soon became so ardent and eager that the stars often disappeared in the light of morning whilst I was yet engaged in my laboratory.
But her temper was fluctuating; joy for a few instants shone in her eyes, but it continually gave place to distraction and reverie.
There are no more uses of "fluctuate" in the book.
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Cattle markets tend to fluctuate a lot, and some years, you don’t make much of anything.