Adjective
Not stable.
(electronics) Having multiple states, none of which is stable.
Source: en.wiktionary.orgThis latch circuit is similar to an astable multivibrator, except that there is no charge or discharge time, due to the absence of capacitors. Source: Internet
The circuit can be thought as a 1/2 astable multivibrator. Source: Internet
Operation The circuit has two astable (unstable) states that change alternatively with maximum transition rate because of the "accelerating" positive feedback. Source: Internet