'unpredictably-placed' originates from the combination of 'unpredictable' and 'placed'. 'Unpredictable' comes from Latin 'un-' meaning 'not' and 'predict' from 'praedicere' meaning 'to say beforehand'. 'Placed' comes from Old French 'placer', meaning 'to put or set'.

'Unpredictably-placed' evolved from the combination of 'unpredictable' and 'placed', which were used separately in Middle English and later combined in modern English.

Initially, 'unpredictable' meant 'not able to be predicted', and 'placed' meant 'set in a particular position'. Together, they describe something set in a position that cannot be anticipated.