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subject to change
variable
e.g. a fluid situation fraught with uncertainty
e.g. everything was unstable following the coup
Synonym: fluid
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affording no ease or reassurance
e.g. a precarious truce
Synonym: precarious
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highly or violently reactive
e.g. sensitive and highly unstable compounds
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disposed to psychological variability
e.g. his rather unstable religious convictions
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suffering from severe mental illness
e.g. of unsound mind
Synonym: mentally ill unsound
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lacking stability or fixity or firmness
e.g. unstable political conditions
e.g. the tower proved to be unstable in the high wind
e.g. an unstable world economy