superannuate
go out with the ark
obsolesce
Betamax
obsolescent
obsolete
outdate
go by the wayside
outmode
primitive
obsolescence
on its way out
paleolithic
abolishable
antiquate
obsoleteness
outmoded
obsoleter
obsoletor
dated
stagnate
out of the ark
outdatedness
extinct
mismaintain
undermaintain
undefine
misconstruct
paleologism
legacy code
go the way of the dinosaurs
condemn
superannuated
unspecify
invalid
unabolishable
outdatedly
neolithic
disutilize
redundancy
antiquation
dereify
retire
go the way of the dodo
quash
nullify
invalidate
erasively
annul
avoid