When the weather changes from freezing to hot to freezing rapidly and without reason, this is an example of a time when it is unstable.
When a person has a bad temper that can explode or flare up with no provocation at all, this is an example of a person who would be described as unstable.
An unstable ladder.
- Not fixed, firm, or steady; easily upset or unbalanced.
- Changeable; variable; fluctuating.
- Unreliable; fickle.
- Emotionally or psychologically unsettled.
- Tending to decompose or change into other compounds.
Origin of unstable
- un- +"Ž stable