'brilliantly-executed' originates from the combination of 'brilliantly' and 'executed'. 'Brilliantly' comes from 'brilliant', which has roots in the Latin word 'brillare', meaning 'to shine'. 'Executed' comes from the Latin 'executus', the past participle of 'exsequi', meaning 'to follow out'.

'Brilliantly' evolved from the Old French 'brillant', and 'executed' from the Latin 'executus', eventually forming the modern English term 'brilliantly-executed'.

Initially, 'brilliantly' meant 'shining brightly', and 'executed' meant 'carried out'. Over time, 'brilliantly-executed' evolved to mean 'performed with exceptional skill'.