'dishonorably' originates from the Latin word 'dishonorabĭlis', where 'dis-' meant 'apart' and 'honorabilis' meant 'worthy of honor'.

'dishonorabĭlis' transformed into the Old French word 'deshonorable', and eventually became the modern English word 'dishonorable'.

Initially, it meant 'not worthy of honor', and this meaning has largely remained the same in modern usage.