形容词

1. 不稳定的；不可靠的；动荡的
You can describe something as unstable if it is likely to change suddenly, especially if this creates difficulty or danger.

2. 不牢固的；松脱的
Unstable objects are likely to move or fall.

3. （情绪）不稳定的，波动的
If people are unstable, their emotions and behaviour keep changing because their minds are disturbed or upset.

1. subject to change
variable

e.g. a fluid situation fraught with uncertainty
everything was unstable following the coup

Synonym: fluid

2. affording no ease or reassurance

e.g. a precarious truce

Synonym: precarious

3. highly or violently reactive

e.g. sensitive and highly unstable compounds

4. disposed to psychological variability

e.g. his rather unstable religious convictions

5. suffering from severe mental illness

e.g. of unsound mind

Synonym: mentally illunsound

6. lacking stability or fixity or firmness

e.g. unstable political conditions
the tower proved to be unstable in the high wind
an unstable world economy