unstable
//ʌnˈsteɪ.bəl//
Adjective
unstableCanonical form
more unstableComparative
most unstableSuperlative
1
Likely to change or fail; not firmly established or fixed.
The political situation in the region remains unstable.
2
Prone to sudden changes in mood or behavior; emotionally volatile.
She became emotionally unstable after the traumatic event.
3
(Of a substance or structure) likely to give way or collapse; not physically secure.
The old bridge is unstable and could collapse at any moment.
4
(Chemistry, Physics) Liable to decompose, decay, or undergo radioactive change.
Uranium is an unstable element that undergoes radioactive decay.