#thusly

‘Thus’ is from Old English, from the same place as 'that’ and 'this’. Thusly is thus’ ugly second cousin who was born with a tail. The word originally appeared in 1869, and was mostly used ironically. The joke was 'thusly’ was such a silly, stupid word that only an uneducated person trying to sound educated would stoop so low as to use it. However, due to the fact that it’s just plum linguistically useful, it’s crept into the vernacular despite the best efforts of people who even today insist that it’s 'incorrect’.