demure vs coy

demure and coy both are adjectives.

Word	Noun	Adjective	Verb	Adverb
demure	No	Yes	No	No
coy	No	Yes	No	No

As adjectives, demure and coy are synonyms defined as:

demure and coy: affectedly modest or shy especially in a playful or provocative way

Other synonyms of demure include overmodest.

demure (adjective)	coy (adjective)
affectedly modest or shy especially in a playful or provocative way	showing marked and often playful or irritating evasiveness or reluctance to make a definite or committing statement
	affectedly modest or shy especially in a playful or provocative way
	modestly or warily rejecting approaches or overtures