fitly vs duly

fitly and duly both are adverbs.

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

As adverbs, fitly and duly are synonyms defined as:

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

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

fitly (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