unpredictable

adjective

un·pre·dict·able | \ ˌən-pri-ˈdik-tə-bəl

Definition of unpredictable

: not predictable: such as

a : not able to be known or declared in advance unpredictable weather

b : tending to behave in ways that cannot be predicted an unpredictable boss

Other Words from unpredictable Synonyms & Antonyms Example Sentences Learn More about unpredictable

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Other Words from unpredictable

unpredictably \ ˌən-pri-ˈdik-tə-blē

\ adverb

changes that occur unpredictably

unpredictability \ ˌən-pri-ˌdik-tə-ˈbi-lə-tē

\ noun

the unpredictability of the weather

Examples of unpredictable in a Sentence

Recent Examples on the Web

But past accomplishments mean very little in a tournament that is currently so unpredictable. — Luis Miguel Echegaray, SI.com, "History, Rivalry Front and Center in Both Copa America Semifinals," 1 July 2019 Just as traffic and weather are unpredictable when traveling, so is the snack selection. — Samantha Cassetty, NBC News, "The best healthy travel snacks, according to nutritionists and dietitians," 26 June 2019 Because migraines are so unpredictable, migraine sufferers often worry when one is going to strike. — Cory Stieg, refinery29.com, "Khloé Kardashian Got Migraines Following Cheating Scandal," 25 June 2019 Has weather in recent years become more unpredictable? — Karen Zurawski, Houston Chronicle, "SUNDAY CONVERSATION: Lightning sparks Jim Siebert’s interest in weather," 23 June 2019 In eastern Congo, by contrast, the outbreak careered out of control because the area is so lethally unpredictable. — New York Times, "For the Third Time, W.H.O. Declines to Declare the Ebola Outbreak an Emergency," 14 June 2019 My schedule is based on what my donors need and want to do, so life is fully unpredictable. — San Diego Union-Tribune, "From student cold-caller to foundation president, a career dedicated to philanthropy," 8 June 2019 The timing of these jumps is entirely unpredictable. — Chris Lee, Ars Technica, "Following Schrödinger’s cat to its death and giving it a reprieve," 5 June 2019 Then there’s chaotic synchronization, where oscillators that are individually unpredictable nonetheless sync up and evolve together. — Quanta Magazine, "Scientists Discover Exotic New Patterns of Synchronization," 4 Apr. 2019

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'unpredictable.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.