'unpredictably-established' originates from the combination of 'unpredictable' and 'established', where 'unpredictable' comes from Latin 'un-' meaning 'not' and 'predict' meaning 'to declare or tell in advance', and 'established' from Latin 'stabilire' meaning 'to make stable'.

'unpredictably-established' evolved from the combination of the words 'unpredictable' and 'established', which were used separately in Middle English and eventually combined in modern English.

Initially, 'unpredictable' meant 'not able to be predicted', and 'established' meant 'set up on a firm or permanent basis'. The combination retains these meanings in a compound form.