Usage Note
Imprevisible has a single form for both genders (un resultado imprevisible, una persona imprevisible) and its plural is imprevisibles. The prefix im- is the Spanish equivalent of English 'un-/in-', and previsible ('foreseeable') is the positive form. Do not confuse with imprevisto ('unforeseen event/expense'), which functions as a noun.
Examples
"El tiempo en la montaña es muy imprevisible."
Natural Translation
The weather in the mountains is very unpredictable.

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