non-error
unshakable
nondiagnostically
errorlessly
bugless
flawless
unflawed
correction
near thing
nonproblem
nonemergency
kluge
compatible
ironclad
get out of jail free card
watertight
bulletproof
unassailable
immaculately
utility
inappositely
unsententiously
errorful
need-not
unblundered
nonlogarithmically
flyspeck
warts and all
nonchallenge
smooth sailing
impeccable
immaculate
faultless
incorrupted
trouble-free
nonthreat
apposite
unmaliciously
non-prerequisite
nonmonotonically
crutch
nonfailure
accurately
unerringly
unofficiously
approximator
clean
nonexample
nonviolation
remedy