fittingly vs duly

fittingly and duly both are adverbs.

Word	Noun	Adjective	Verb	Adverb
fittingly	No	No	No	Yes
duly	No	No	No	Yes

As adverbs, fittingly and duly are synonyms defined as:

fittingly and duly: in accordance with what is appropriate or suitable for the circumstances

Other synonyms of fittingly include appropriately, befittingly, fitly, properly, suitably.

fittingly (adverb)	duly (adverb)
in accordance with what is appropriate or suitable for the circumstances	in accordance with what is appropriate or suitable for the circumstances