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TOEFL BNC: 6975 COCA: 7097
unstable
adjective /ʌnˈsteɪb(ə)l/
  1. 1
    an unstable person becomes angry or upset often and very suddenly (情绪)多变的,反复无常的

    My father wasn't a bad man, but he was emotionally unstable. 我父亲人不坏,只是情绪反复无常。

     Synonyms and related words
  2. 2
    an unstable government changes often and must deal with a lot of fighting and protests (政局)不稳定的,动荡的
     Synonyms and related words
    Words used to describe systems and types of government: absolute, absolutist, autonomous...
  3. 3
    an unstable system, situation, or relationship often has serious problems (体制、情况或关系)不稳定的,常出问题的

    an unstable economy 不稳定经济

  4. 4
    chemistry an unstable substance reacts very easily with other chemical substances and can be dangerous (物质)不稳定的
     Synonyms and related words
    Describing chemicals and chemical processes: active, aerobic, alkaline...
  5. 5
    chemistry relating to a radioactive substance whose nucleus breaks down to release radioactivity
     Synonyms and related words
  6. 6
    physics an unstable object is likely to move or change because of the forces affecting it
     Synonyms and related words
    Not reliable or trustworthy: official, unreliable, suspect...

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