needed Antonyms

not good irrelevant unimportant worthless useless unessential trivial tautologic surplus supplementary supplanter supervenient supernumerary superfluous superaddition substituent subordinate unnecessary backup unwanted unrequested unasked spare part overpayment unneeded fallback expendable non-essential elidable de trop nonmandatory meter maid off-color locum fill-in secondary residuary ensuing emergency disposable dispensable discretionary deadwood chargeless auxiliary ascititious another ancillary alternative alternate