'vaguely-detailed' originates from the combination of 'vague' and 'detailed', where 'vague' comes from Latin 'vagus' meaning 'wandering' and 'detailed' from Old French 'detail' meaning 'small piece'.

'vague' changed from Latin 'vagus' to Old French 'vague' and eventually became the modern English word 'vague'. 'Detailed' evolved from Old French 'detail' to Middle English 'detaile' and then to modern English 'detailed'.

Initially, 'vague' meant 'wandering' and 'detailed' meant 'small piece', but over time they evolved to mean 'not clear' and 'full of details' respectively.