unpredictable

/ˌʌnprɪˈdɪktəbl/

Say it: un-prih-DIK-tuh-bull

1. adjective Not able to be foreseen or declared in advance; likely to change suddenly.
The weather in the mountains is notoriously unpredictable.
2. adjective Behaving in a way that is not expected or is inconsistent.
He's a brilliant but unpredictable player, capable of both genius and simple errors.

📖 Seen in the wild

The weather in the mountains can be notoriously unpredictable, changing rapidly from sunshine to snow.
collected by @vocablast

✏️ unpredictable in a sentence

The stock market has been highly unpredictable this quarter, reacting to global events.
Her unpredictable moods were a source of both fascination and frustration for him.
Our project timeline is at the mercy of an unpredictable supply chain.
I love my cat, but he's so unpredictable; one minute he's purring, the next he's scratching.
The path of the hurricane remains unpredictable, with models showing several possible landfalls.
He has an unpredictable sense of humor that always keeps us guessing.

🔁 Synonyms & antonyms

erratic capricious volatile mercurial fickle inconsistent changeable variable

erratic · implies irregular, inconsistent, and often aimless change.

capricious · suggests sudden, unaccountable changes in mood or behavior, often seen as whimsical.

volatile · describes rapid, extreme change, often with a sense of instability or danger.

mercurial · refers to quick and unpredictable changes in mood, like the Roman god Mercury.

Opposites: predictable, reliable, consistent, dependable, stable

🌱 Where it comes from

The word is a straightforward combination of the prefix 'un-', meaning 'not', and the adjective 'predictable'. 'Predictable' itself comes from the verb 'predict', which traces back to the Latin 'praedicere', meaning 'to foretell'. This Latin root is formed from 'prae' (before) and 'dicere' (to say), so 'unpredictable' literally means 'not able to be said before'.

🧩 How it's used

Common patterns:

highly unpredictableunpredictable weatherunpredictable behavioran unpredictable outcomecompletely unpredictablenotoriously unpredictable

Unpredictable is a versatile and common word suitable for most contexts, from casual conversation to technical writing. Its connotation depends entirely on what is being described. We value predictability in things like safety systems and income, making 'unpredictable' negative in those cases. However, we often enjoy unpredictability in entertainment, art, and sports, where it creates excitement and suspense.

Word family: predict, prediction, predictable, predictably, unpredictability, unpredictably

💬 Quick answers

What does unpredictable mean?

It describes something that cannot be foreseen or known in advance, often because it is subject to sudden changes.

What's the difference between unpredictable and erratic?

Unpredictable is a general term for something that can't be foreseen. Erratic is more specific, suggesting behavior that is not only unpredictable but also irregular, inconsistent, and perhaps aimless.

Is unpredictable a negative word?

It depends on the context. An unpredictable plot twist is good, but an unpredictable income is stressful. The word itself is neutral, but the situation gives it a positive or negative connotation.

Can a person be unpredictable?

Yes, a person who behaves in unexpected ways or whose moods change suddenly can be described as unpredictable.

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