'justly-treated' originates from the English word 'justly,' which comes from the Latin word 'justus,' meaning 'fair' or 'right,' and 'treated,' from the Old French 'traitier,' meaning 'to handle or deal with.'

'justly' evolved from the Latin 'justus' through Old French 'juste,' and 'treated' from Old French 'traitier,' eventually forming the modern English term 'justly-treated.'

Initially, 'justly' meant 'in a fair manner,' and 'treated' meant 'handled or dealt with.' The combined term 'justly-treated' retains this meaning of being handled in a fair manner.