According to the OED, "thusly" is colloquial term for "thus" dating to
the 19th century. Actually, I think it's a mistake made by elegant
Victorians trying to pretty up the adverb. It's not shown as a
separate word.

Webster's Collegiate of course regards it as word without any
apologies. American lexicographers gave up standards at about the same
time American universities did. To do otherwise would be to enforce
the the Male Gaze, or the Canon, or sumpin.

all the best -- Dan Ford
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