closed vs unopen

closed and unopen both are adjectives.

Word	Noun	Adjective	Verb	Adverb
closed	No	Yes	No	No
unopen	No	Yes	No	No

As adjectives, closed and unopen are synonyms defined as:

Other synonyms of closed include shut.

closed (adjective)	unopen (adjective)
not open or affording passage or access	not open
(set theory) of an interval that contains both its endpoints
used especially of mouth or eyes
not open
blocked against entry
not open to the general public
with shutters closed
requiring union membership
not having an open mind