'roughly-measured' originates from the combination of 'roughly' and 'measured', where 'roughly' means 'approximately' and 'measured' means 'determined by measurement'.

'roughly' and 'measured' were combined in modern English to form the adjective 'roughly-measured'.

Initially, 'roughly' meant 'in a rough manner', and 'measured' meant 'determined by measurement'. Together, they evolved to mean 'estimated without precision'.