Nieprzewidywalnych
Nieprzewidywalnych is the genitive plural form of the Polish adjective nieprzewidywalny, which translates to “unpredictable” in English. The word is formed with the negative prefix nie- attached to przewidywalny (predictable), and it functions as a descriptive modifier in sentences.
Grammatical notes indicate that nieprzewidywalny is an adjective and must agree with the noun it describes
Usage and nuance: nieprzewidywalny, the lemma, is used to describe events, behavior, or conditions that are difficult
See also: predictable (przewidywalny), unpredictability (nieprzewidywalność), negation prefixes in Polish (nie-).