properly vs decently

properly and decently both are adverbs.

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

As adverbs, properly and decently are synonyms defined as:

Other synonyms of properly include decent, right.

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