unstable

 
Pronunciation: /ʌnˈsteɪb(ə)l/

adjective (unstabler, unstablest)

  • likely to give way; not stable: the unstable cliff tops
  • likely to change or fail; not firmly established: an unstable government
  • prone to psychiatric problems or sudden changes of mood: he was mentally unstable

Derivatives

unstableness

noun

unstably

adverb