definition of
unstable

[1] #1 unstable a. lacking stability or fixity or firmness; "unstable political conditions"; "the tower proved to be unstable in the high wind"; "an unstable world economy". wn

[2] #2 unstable s. [precarious] affording no ease or reassurance; "a precarious truce". wn

[3] #3 unstable s. [mentally ill, unsound] suffering from severe mental illness; "of unsound mind". wn

[4] #4 unstable s. disposed to psychological variability; "his rather unstable religious convictions". wn

[5] #5 unstable s. [fluid] subject to change; variable; "a fluid situation fraught with uncertainty"; "everything was unstable following the coup". wn