If you describe someone or something as unpredictable, you mean that you cannot tell what they are going to do or how they are going to behave. adj
He is utterly unpredictable., ...Britain's notoriously unpredictable weather.
unpredictably adv usu ADV with v, ADV adj
Monthly costs can rise or fall unpredictably., ...her husband's unpredictably violent behavior to others.
unpredictability n-uncount oft with poss
...the unpredictability of the weather.
Translation English - Cobuild Collins Dictionary
chance, changeable, doubtful, erratic, fickle, fluky (informal) hit-and-miss (informal) hit-or-miss (informal) iffy (informal) inconstant, random, unforeseeable, unreliable, unstable, variable
certain, constant, dependable, foreseeable, predictable, reliable, stable, steady, unchanging
English Collins Dictionary - English synonyms & Thesaurus
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"Collins Cobuild English Dictionary for Advanced Learners 4th edition published in 2003 © HarperCollins Publishers 1987, 1995, 2001, 2003 and Collins A-Z Thesaurus 1st edition first published in 1995 © HarperCollins Publishers 1995"