duly vs fitly

duly and fitly both are adverbs.

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

As adverbs, duly and fitly are synonyms defined as:

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

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

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