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extraneous, extra, superfluous | not essential | |
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wasted, otiose, senseless, superfluous, pointless, purposeless, redundant, needless | serving no useful purpose; having no excuse for being | |
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surplus, extra, excess, redundant, spare, supererogatory, superfluous, supernumerary, pleonastic, extraneous, excessive, unnecessary, extravagant | more than is needed, desired, or required |