duly vs befittingly

duly and befittingly both are adverbs.

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

As adverbs, duly and befittingly are synonyms defined as:

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

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

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