'dishonestly-gained' originates from the combination of 'dishonest' and 'gain', where 'dishonest' comes from Old French 'deshoneste', meaning 'shameful', and 'gain' from Old French 'gaain', meaning 'profit'.

'dishonest' changed from the Old French word 'deshoneste' and eventually became the modern English word 'dishonest'. 'Gain' transformed from the Old French word 'gaain' and became the modern English word 'gain'.

Initially, 'dishonest' meant 'shameful', but over time it evolved into its current meaning of 'not honest'. 'Gain' has largely retained its meaning of 'profit'.