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1. Having unpredictable ups and downs
   "fluctuating prices"

1. Cause to fluctuate or move in a wavelike pattern
    
2. Move or sway in a rising and falling or wavelike pattern
   "the line on the monitor fluctuated";
   - vacillate, waver
    
3. Be unstable
   "The stock market fluctuates"

See also: unsteady

Type of: change state, displace, move, swing, turn