This question already has an answer here:
- “Thus” vs. “Thusly” 5 answers
Which is correct?
...others are compensated thus.
...others are compensated thusly.
This page says 'thusly' is incorrect: http://www.thefreedictionary.com/thusly However without the 'ly' is sounds wrong.
This page on adverbs didn't mention adverbs at the end of a sentence as being wrong. http://grammar.ccc.commnet.edu/grammar/adverbs.htm
It provides some examples:
A viewpoint adverb generally comes after a noun and is related to an adjective that precedes that noun:
A successful athletic team is often a good team scholastically.
I just think '...a good team scholastical' would be wrong. Why is 'thus' different?
This related question also says 'thus' over 'thusly', but the word was not at the end of a sentence. "Thus" vs. "Thusly"