'slowly-gained' originates from the combination of 'slowly,' meaning 'at a slow pace,' and 'gained,' the past participle of 'gain,' meaning 'to acquire or obtain.'

'Slowly' comes from Old English 'slāwlice,' and 'gained' comes from Old French 'gaigner,' which evolved into the modern English 'gain.'

Initially, 'gain' meant 'to acquire or win,' and 'slowly' meant 'at a slow pace.' The combination emphasizes the gradual nature of acquisition.