'foreseeably-unstable' originates from the combination of 'foreseeably' and 'unstable'. 'Foreseeably' comes from 'foresee', which originates from Old English 'foreseon', meaning 'to see beforehand'. 'Unstable' comes from Latin 'instabilis', where 'in-' meant 'not' and 'stabilis' meant 'standing firm'.

'Foreseeably' evolved from the Old English 'foreseon', while 'unstable' transformed from the Latin 'instabilis' to the modern English 'unstable'.

Initially, 'foresee' meant 'to see beforehand', and 'unstable' meant 'not standing firm'. The combined term 'foreseeably-unstable' retains these meanings, indicating a state that is predictably not firm.