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Meaning & Definition of Unstable in English

English

Unstable

/ənstebəl/

adjective

1. Lacking stability or fixity or firmness

  • "Unstable political conditions"
  • "The tower proved to be unstable in the high wind"
  • "An unstable world economy"
    synonym:
  • unstable

2. Highly or violently reactive

  • "Sensitive and highly unstable compounds"
    synonym:
  • unstable

3. Affording no ease or reassurance

  • "A precarious truce"
    synonym:
  • precarious
  • ,
  • unstable

4. Suffering from severe mental illness

  • "Of unsound mind"
    synonym:
  • mentally ill
  • ,
  • unsound
  • ,
  • unstable

5. Disposed to psychological variability

  • "His rather unstable religious convictions"
    synonym:
  • unstable

6. Subject to change

  • Variable
  • "A fluid situation fraught with uncertainty"
  • "Everything was unstable following the coup"
    synonym:
  • fluid
  • ,
  • unstable

Examples of using

Do not place the console or accessories on surfaces that are unstable, tilted or subject to vibration.
Antimatter is highly unstable.