Synonyms for Superfluous (same or very similar meaning)
WordNet sense 1 (serving no useful purpose; having no excuse for being):
otiose, pointless, wastedWordNet sense 2 (lacking in usefulness or value):
worthlessWordNet sense 3 (more than is needed, desired, or required):
excess, extra, redundant, spare, supererogatory, supernumerary, surplusWordNet sense 4 (not necessary):
unnecessaryFrom the ODE community, based on WordNetadd/edit