'unjustly-assigned' originates from the combination of 'unjustly' and 'assigned'. 'Unjustly' comes from 'unjust', which is derived from Latin 'iniustus', where 'in-' meant 'not' and 'iustus' meant 'just'. 'Assigned' comes from Latin 'assignare', where 'ad-' meant 'to' and 'signare' meant 'mark'.

'Unjustly-assigned' evolved from the combination of 'unjustly' and 'assigned', which were used separately in Middle English and later combined in modern English.

Initially, 'unjustly' meant 'in a manner not just', and 'assigned' meant 'allocated'. Together, they evolved to mean 'allocated in an unfair manner'.