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Word a Day

unstable

adjective · /ənˈsteɪbəl/ · Level 1 · Starter

What does unstable mean?

unstable (adjective): lacking stability or fixity or firmness.

Definition: Princeton WordNet 3.1.

How do you use unstable in a sentence?

How do you pronounce unstable?

/ənˈsteɪbəl/ (IPA, American English). The app reads every word aloud.

Where does unstable come from?

From Middle English unstable; equivalent to un- (“not”) + stable.

Etymology: Wiktionary, CC BY-SA 4.0.

Test yourself: do you know “unstable”?

Tap an answer to check it. The same questions the app asks.

What does “unstable” mean?

lacking stability or fixity or firmness

Right! That's what “unstable” means.

first in a series of copies or versions

Not quite: that's what original means.

having or giving off a high temperature

Not quite: that's what hot means.

of lesser importance or stature or rank

Not quite: that's what minor means.

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