nonfunctional

adjectives

not having or performing a function
antonym
is similar to
not structural
is similar to
serving an esthetic rather than a useful purpose
"cosmetic fenders on cars"; "the buildings were utilitarian rather than decorative"
see also
not ready for service
"unserviceable equipment may be replaced"
is an attribute of
what something is used for
"the function of an auger is to bore holes"; "ballet is beautiful but what use is it?"
not performing or able to perform its regular function
"a malfunctioning valve"