'predictably-retained' originates from the combination of 'predictably' and 'retained'. 'Predictably' comes from 'predict', which originates from Latin 'praedicere', meaning 'to foretell'. 'Retained' comes from 'retain', which originates from Latin 'retinere', meaning 'to hold back'.

'Predictably' evolved from the Latin 'praedicere' through Old French 'predire', and 'retained' evolved from Latin 'retinere' through Old French 'retenir'.

Initially, 'predictably' meant 'in a manner that can be foretold', and 'retained' meant 'held back'. Together, they imply something kept in a foreseeable manner.