Etymology
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thusly (adv.)

1865 (in an Artemus Ward dialect humor piece), from thus + -ly (2). A double adverb. Perhaps originally a humorous or mocking over-correction of thus; it has gained some currency but earns frowns for the user.

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Definitions of thusly

thusly (adv.)
in the way indicated; (`thusly' is a nonstandard variant);
Synonyms: thus / so
From wordnet.princeton.edu