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  2. not firm and therefore not strong, safe, or likely to last: It is a poor and politically unstable country. An unstable person suffers from sudden and extreme changes of mental state: He’s emotionally unstable – you never know how he’ll react.

    • Unstable

      UNSTABLE definition: 1. likely to change or end suddenly: 2....

  3. If people are unstable, their emotions and behaviour keep changing because their minds are disturbed or upset. He was emotionally unstable. Coleridge was also a highly unstable person.

  4. The meaning of UNSTABLE is not stable : not firm or fixed : not constant. How to use unstable in a sentence. Synonym Discussion of Unstable.

  5. To be unstable is to lack stability, meaning things could change without warning, like an unstable bookshelf that is likely to fall down. If you are unstable emotionally, you might be ecstatically happy one minute and horribly depressed and angry the next.

  6. Relating to a chemical compound that readily decomposes or changes into other compounds or into elements. Relating to an atom or chemical element that is likely to share electrons; reactive. Characterized by uncertain or inadequate response to treatment and the potential for unfavorable outcome, as the status of a medical condition or disease.

  7. 1. You can describe something as unstable if it is likely to change suddenly, especially if this creates difficulty or danger. [...] 2. Unstable objects are likely to move or fall. [...] 3. If people are unstable, their emotions and behaviour keep changing because their minds are disturbed or upset. [...]

  8. UNSTABLE definition: 1. likely to change or end suddenly: 2. If someone is unstable, their moods and behaviour change…. Learn more.

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