UNPREDICTABLE Synonyms: 75 Similar and Opposite Words

unpredictable

adjective

ˌən-pri-ˈdik-tə-bəl

Definition of unpredictable

as in volatile

likely to change frequently, suddenly, or unexpectedly unpredictable spring weather that makes it really hard to know what to wear

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Examples are automatically compiled from online sources to show current usage. Read More Opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback.

Recent Examples of unpredictable But a major challenge is ensuring these robots perform reliably beyond the lab, particularly in messy, unpredictable or low-visibility conditions. — Bo Wang, The Conversation, 28 Sep. 2026 Layering was a popular strategy for dealing with the city’s famously unpredictable weather. — Angela Velasquez, Footwear News, 28 Sep. 2026 People can perform under high standards, but unpredictable standards destroy performance. — Expert Panel®, Forbes.com, 28 Sep. 2026 The hours worked by OB-GYNs were known to be long and unpredictable. — Sacbee.com, 28 Sep. 2026 See All Example Sentences for unpredictable

Recent Examples of Synonyms for unpredictable

Adjective

For some investors, the volatile situation is leading to a more intent focus on core balance sheet metrics led by free cash flow, which measures the cash left over after expenses, interest, taxes and long-term investments.

— Cheryl Winokur Munk, CNBC, 30 Sep. 2026
Goods would become more expensive and supply chains more volatile and prone to disruption.

— Michael Albertus, Foreign Affairs, 30 Sep. 2026

Definition of volatile

Adjective

Unlike a recruiting leader, an engineer sees a production system with no architecture, an unreliable supply chain, an unstable line and no-exception handling.

— Pradeep Prasana Kanagaraj, Forbes.com, 25 Sep. 2026
Neutrons are unstable when they’re not bound in nuclei, spontaneously spitting out lighter particles in about 15 minutes to become the slightly lighter proton.

— Cara Giovanetti, The Conversation, 25 Sep. 2026

Definition of unstable

Adjective

Rigorous, blustery winter; winding sleety spring; hot, moist enervating summer; changeful autumn with its dog-days; these are absolutely unknown.

— San Diego Union-Tribune, San Diego Union-Tribune, 1 Jan. 2023
Hers is the kind of face that inspires directors to tight framing — gleaming, as if smoothed from marble, and yet somehow pliant, changeful.

— Jordan Kisner Jack Davison, New York Times, 11 Oct. 2022

Definition of changeful

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“Unpredictable.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/unpredictable. Accessed 4 Oct. 2026.

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Synonyms of unpredictable

adjective

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