'roughly-separated' originates from the combination of 'roughly' and 'separated'. 'Roughly' comes from the Old English word 'ruh', meaning 'not smooth', and 'separated' comes from the Latin word 'separatus', meaning 'to divide'.

'Roughly' evolved from the Old English 'ruh', and 'separated' evolved from the Latin 'separatus', eventually forming the modern English term 'roughly-separated'.

Initially, 'roughly' meant 'not smooth', and 'separated' meant 'to divide'. Over time, 'roughly-separated' came to mean 'divided in an imprecise manner'.