in ‧ sta ‧ bil ‧ i ‧ ty AC /ˌɪnstəˈbɪləti, ˌɪnstəˈbɪlɪti/ BrE AmE noun ( plural instabilities ) [uncountable and countable]
1 . when a situation is not certain because there is the possibility of sudden change OPP stability :
the instability of the market
political instability in the region
2 . mental problems that are likely to cause sudden changes of behaviour ⇨ unstable :
nervous instability