Unstable
Part of speech: adjective
Definition: Having a strong tendency to change Fluctuating; not constant fickle unpredictable Readily decompasable Radioactive, especially with a short half-life
Example sentence: If Egypt is unstable, then the entire region is unstable.
Unsound
Part of speech: adjective
Definition: Not sound; not whole; not solid; defective; infirm; diseased.