Unstable

adjective

1. not stable : not firm or fixed : not constant: such as
2. not steady in action or movement : irregular
3. wavering in purpose or intent : vacillating
4. lacking steadiness : apt to move, sway, or fall
5. liable to change or alteration
6. readily changing (as by decomposing) in chemical or physical composition or in biological activity
7. characterized by lack of emotional control