unstable
1. [ adjective ] lacking stability or fixity or firmness
Examples:

"unstable political conditions" "the tower proved to be unstable in the high wind" "an unstable world economy"

Related terms: stable explosive rickety crank seismic rocky top-heavy disturbed coseismic volcanic labile tottering thermolabile impermanent unsteady inconstant
2. [ adjective ] affording no ease or reassurance
Synonyms: precarious
Examples:

"a precarious truce"

Related terms: uneasy
3. [ adjective ] (chemistry) highly or violently reactive
Examples:

"sensitive and highly unstable compounds"

Related terms: reactive
4. [ adjective ] suffering from severe mental illness
Synonyms: mentally_ill unsound
Examples:

"of unsound mind"

Related terms: insane
5. [ adjective ] (psychology) disposed to psychological variability
Examples:

"his rather unstable religious convictions"

Related terms: irresolute
6. [ adjective ] subject to change; variable
Synonyms: fluid
Examples:

"a fluid situation fraught with uncertainty" "everything was unstable following the coup

Related terms: changeable
Similar spelling:   unactable
  unsuitable
  unquotable
  unstaple
  ungetatable
  unstoppable
  unhostile
  unexcitable
  unstated
  unstaged
  unsatiable
  unstarred
  unstained
  unstrained
  unstrap
  unstartling
  unsuitably
  unsteady
  unstrain
  unused
  unaesthetic
  Unzueta