unstable

1. Not stable.

   unstable foundation

   The structure is too unstable to stand safely.

   instabil, labil

   неусто́йчивыйneustójčivyj

2. Having a strong tendency to change.

   subject to change; variable

3. Fluctuating; not constant.

   politically unstable

   The political situation remains unstable.

4. (figuratively)Fickle.

5. (figuratively)Unpredictable.

6. Readily decomposable.

   chemically unstable

7. Radioactive, especially with a short half-life.

1. I think that Tom is unstable.

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2. Tom told me Mary was emotionally unstable.

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3. Tom is mentally unstable.

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4. Tom is emotionally unstable.

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5. I think Tom is unstable.

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