Definition of UNSTABLE

unstable

Adjective

  • Not firm or steady; prone to change or collapse.
  • lacking stability or fixity or firmness
    • "unstable political conditions"
    • "the tower proved to be unstable in the high wind"
    • "an unstable world economy"

Adjective Satellite

  • highly or violently reactive
    • "sensitive and highly unstable compounds"
  • affording no ease or reassurance
  • suffering from severe mental illness
  • disposed to psychological variability
    • "his rather unstable religious convictions"
  • subject to change; variable
    • "everything was unstable following the coup"

Adj

  • Not stable.
  • Having a strong tendency to change.
  • Fluctuating; not constant.
  • Fickle.
  • Unpredictable.
  • Readily decomposable.
  • Radioactive, especially with a short half-life.

Verb

Verb Forms: unstabler, unstablest

  • To release (an animal) from a stable.

Examples

  • His lead in Words With Friends felt unstable, knowing his opponent had a full rack.

Origin / Etymology

From Middle English unstable; equivalent to un- (not) + stable.

Antonyms

stable

Scrabble Score: 10

unstable: valid Scrabble (US) TWL Word
unstable: valid Scrabble Word in Merriam-Webster MW Dictionary
unstable: valid Scrabble Word in International Collins CSW Dictionary

Words With Friends Score: 14

unstable: valid Words With Friends Word