unstable

Universal Words adjective 1 likely to change suddenly: unstable share prices * The political situation remains highly unstable. 2 if people are unstable, their behaviour and emotions change often and suddenly because their minds are upset: emotionally / mentally unstable 3 likely to move or fall: Icebergs are notoriously unstable and are likely to turn over. 4 (technical) (of a substance) not staying in the same chemical or ATOMIC state: chemically unstable OPPSTABLE seealsoINSTABILITY