unstable

1. 1

   Not stable.

   • unstable foundation
   • The structure is too unstable to stand safely.
2. 2

   Having a strong tendency to change.

   • The dawn of the oil age was fairly recent. Although the stuff was used to waterproof boats in the Middle East 6,000 years ago, extracting it in earnest began only in 1859 after an oil strike in Pennsylvania.[…]It was used to make kerosene,
3. 3

   Fluctuating; not constant.

   • politically unstable
   • The political situation remains unstable.
4. 4

   Fickle.figuratively

5. 5

   Unpredictable.figuratively

   • All of the characters in Rocko's Modern Life are anthropomorphic animals of varying species, the vast majority of whom are mentally unstable. Murray said that he matched personalities of his characters to the various animals in the series t
6. 6

   Readily decomposable.

   • chemically unstable
7. 7

   Radioactive, especially with a short half-life.

syn. tottering · unsteady · wobbly

ant. stable

1. 1

   To release (an animal) from a stable.transitive

   • When the last tune of music floated from the fleet, he unstabled his quarter horse and headed for the coastal road leading west and north on his circuit.