'justly-managed' originates from the combination of 'justly' and 'managed'. 'Justly' comes from the word 'just', which originates from Latin 'justus', meaning 'lawful, rightful'. 'Managed' comes from the word 'manage', which originates from Italian 'maneggiare', meaning 'to handle'.

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

Initially, 'justly' meant 'in a just manner', and 'managed' meant 'handled or controlled'. The combination 'justly-managed' evolved to mean 'managed in a fair and equitable manner'.