noncurrent
abandoned
abjured
antiquated
antique
archaic
back-number
behind the times
dated
deserted
discontinued
disused
done with
has-been
not worth saving
obsolescent
obsolete
old
old hat
old-fashioned
old-timey
oldfangled
on the shelf
out
out of fashion
out of season
out of use
out-of-date
outmoded
outworn
past use
pensioned off
relinquished
renounced
resigned
retired
styleless
superannuate
superannuated
superseded
unfashionable
worn-out
arcane
cumbersome
farfetched
faulty
flawed
geeky
inaccurate
inadequate
ineffective
mislead
off-balance
overcrowded
overdraw
self-referential
understaffed
unorthodox
unrealistic
unscientific
up-to-date