'indistinctly-merged' originates from the combination of 'indistinctly' and 'merged'. 'Indistinctly' comes from Latin 'indistinctus', where 'in-' meant 'not' and 'distinctus' meant 'separated'. 'Merged' comes from Latin 'mergere', meaning 'to dip' or 'to immerse'.

'Indistinctly' evolved from the Latin 'indistinctus' through Old French 'indistinct', while 'merged' evolved from Latin 'mergere' through Old French 'mergier'.

Initially, 'indistinctly' meant 'not separated', and 'merged' meant 'to immerse'. Over time, they combined to describe something that is not clearly separated or defined.