"fluctuating" in the verb sense
cause to fluctuate or move in a wavelike pattern
2. fluctuate, vacillate, waver
move or sway in a rising and falling or wavelike pattern
"the line on the monitor vacillated"
"The stock market fluctuates"
"fluctuating" in the adjective sense
having unpredictable ups and downs
Source: WordNet® (An amazing lexical database of English)
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