'predictably-unstable' is a compound word formed from 'predictably' and 'unstable'. 'Predictably' originates from Latin, specifically the word 'praedicere', where 'prae-' meant 'before' and 'dicere' meant 'to say'. 'Unstable' comes from Latin 'instabilis', where 'in-' meant 'not' and 'stabilis' meant 'standing firm'.

'Predictably' evolved from the Latin 'praedicere' through Old French 'predire', and 'unstable' evolved from Latin 'instabilis' through Old French 'instable'.

Initially, 'predictably' meant 'able to be foretold', and 'unstable' meant 'not firm'. Together, they describe something that is expected to be changeable.