seemly vs decorous

seemly and decorous both are adjectives.

Word	Noun	Adjective	Verb	Adverb
seemly	No	Yes	No	No
decorous	No	Yes	No	No

As adjectives, seemly and decorous are synonyms defined as:

Other synonyms of seemly include becoming, comely, comme il faut.

seemly (adjective)	decorous (adjective)
according with custom or propriety	characterized by propriety and dignity and good taste in manners and conduct
	according with custom or propriety