Open English Wordnet
Adjectives
(a)unstablelacking stability or fixity or firmness“unstable political conditions”,
“the tower proved to be unstable in the high wind”,
“an unstable world economy” (s)unstablehighly or violently reactive“sensitive and highly unstable compounds” (s)unstabledisposed to psychological variability“his rather unstable religious convictions” (s)fluid, unstablesubject to change; variable“a fluid situation fraught with uncertainty”,
“everything was unstable following the coup”