duly vs properly

duly and properly both are adverbs.

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

As adverbs, duly and properly are synonyms defined as:

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

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

duly (adverb)	properly (adverb)
in accordance with what is appropriate or suitable for the circumstances	in the right manner; correctly; suitably
	in accordance with what is appropriate or suitable for the circumstances
	indicating exactness or preciseness