4 days ago · The meaning of UNPREDICTABLE is not predictable. How to use unpredictable in a sentence. likely to change suddenly and without reason and therefore not able to be predicted (= expected…. When something's unpredictable, it doesn't happen at expected times or it can't be predicted. If trains were unpredictable, they wouldn't follow a set schedule and you'd never know when one would arrive. 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. He is utterly unpredictable. ...Britain's notoriously … May 9, 2026 · Adjective unpredictable (comparative more unpredictable, superlative most unpredictable) Unable to be predicted. Synonyms: (far less common) nonpredictable, vagabond Antonym: predictable 1. not predictable; variable, uncertain, or erratic. something that is unpredictable. Definition of unpredictable adjective from the Oxford Advanced Learner's Dictionary. that cannot be predicted because it changes a lot or depends on too many different things. The unpredictable … Find 69 different ways to say UNPREDICTABLE, along with antonyms, related words, and example sentences at Thesaurus.com.