'deceptively-gained' originates from the combination of 'deceptive' and 'gain', where 'deceptive' comes from Latin 'decipere', meaning 'to ensnare or cheat', and 'gain' from Old French 'gaigner', meaning 'to earn or win'.

'deceptive' changed from the Latin word 'decipere' to the Old French 'deceptif', and eventually became the modern English word 'deceptive'. 'Gain' evolved from Old French 'gaigner' to Middle English 'gainen', and eventually became the modern English word 'gain'.

Initially, 'deceptive' meant 'to ensnare or cheat', but over time it evolved into its current meaning of 'misleading'. 'Gain' has largely retained its original meaning of 'to earn or win'.