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unstable

Meaning in simple English, pronunciation and examples

Pronunciation: US /ʌnˈsteɪbəl/

unstable means: Likely to move, fall, fail, or change suddenly because it is not firm or secure.

adjective

NOT STEADYB2

Likely to move, fall, fail, or change suddenly because it is not firm or secure.

  • This chair is unstable.
  • The house stood on unstable ground.
  • Engineers warned that the damaged bridge was unstable.

Similar words: unsteady, insecure

Opposites: stable, steady

Common phrases: unstable ground, unstable structure, unstable ladder

KEEPS CHANGINGB2

Changing often or suddenly rather than staying the same.

  • Fuel prices are unstable.
  • The country remained politically unstable for years.
  • Unstable weather made it difficult to plan the trip.

Similar words: changeable, volatile

Opposites: stable, constant

Common phrases: unstable prices, politically unstable, unstable economy

BREAKS DOWN EASILYC1

Likely to break down chemically or change into other substances easily.

  • The compound is chemically unstable.
  • Heat can make this substance unstable.
  • Unstable molecules may break apart during storage.

Opposites: stable

Common phrases: chemically unstable, unstable compound, unstable molecule

Questions about unstable

What does unstable mean?

Likely to move, fall, fail, or change suddenly because it is not firm or secure.

What is unstable in other languages?

Türkçe: dengesiz · Español: inestable · Français: instable · Deutsch: instabil · Italiano: instabile · 日本語: 不安定な

How do you pronounce unstable?

It is pronounced /ʌnˈsteɪbəl/.

How do you use unstable in a sentence?

This chair is unstable. The house stood on unstable ground.

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