Collocations for unstable - adj.

appear, be, seem
become
remain
make sth, render sth
Prison order is rendered unstable by young inmates serving short sentences.

extremely, fairly, very, etc.
highly
increasingly
relatively
inherently
potentially
notoriously
The building trade is notoriously unstable.

dangerously
economically, financially, politically
a politically unstable region

be, seem
become

extremely, fairly, very, etc.
highly
emotionally, mentally, psychologically
vulnerable, emotionally unstable individuals

Unstable is used with these nouns:
atom, environment, situation