adjective
unpredictable
adjective
1
Impossible to know or foresee in advance.
"His moods were unpredictable, swinging from cheerful to furious in minutes."
"The stock market has been unpredictable all year."
How to Use Unpredictable
Learner’s notesIn plain EnglishImpossible to guess what will happen next.
Common pairings
unpredictable weather
unpredictable behavior
wildly unpredictable
Word Forms
more unpredictable comparative, unpredictables plural, most unpredictable superlative
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His moods were _____, swinging from cheerful to furious in minutes.
Etymology
From un- + predictable.