Impermanent
Part of speech: adjective
Definition: Not permanent; momentary.
Unstable
Part of speech: adjective
Definition: Having a strong tendency to changeFluctuating; not constantfickleunpredictableReadily decompasableRadioactive, especially with a short half-life
Example sentence: If Iran becomes a nuclear weapon state it is the end of non-proliferation as we know it. If Iran gets a nuclear weapon you are likely to see Saudi, Egypt and other countries follow suit and we will bequeath to the next generation a nuclear arms race in the world's most unstable region.