'masterfully-performed' originates from the combination of 'masterfully' and 'performed', where 'masterfully' is derived from 'master' meaning 'one who has control or authority' and '-fully' meaning 'in a manner of'. 'Performed' comes from 'perform', which originates from Old French 'parfournir', meaning 'to complete'.

'masterfully' evolved from Middle English 'maisterful', and 'performed' from Middle English 'performen'.

Initially, 'masterfully' meant 'in a manner of a master', and 'performed' meant 'to carry out'. Over time, they combined to describe an action done with great skill.