'slowly-reviewed' is a compound word formed from 'slowly' and 'reviewed'. 'Slowly' originates from Old English 'slāwlice', meaning 'in a slow manner', and 'reviewed' comes from the Old French 'reviu', meaning 'to see again'.

'Slowly' evolved from the Old English 'slāwlice', and 'reviewed' from the Old French 'reviu', eventually forming the modern English compound 'slowly-reviewed'.

Initially, 'slowly' meant 'in a slow manner', and 'reviewed' meant 'to see again'. Together, they describe a process of careful examination over time.