WordNet sense 1 (more than is needed, desired, or required):

excess, extra, spare, supererogatory, superfluous, supernumerary, surplus

WordNet sense 2 (not necessary):

unnecessary

WordNet sense 3 (tediously prolonged or tending to speak or write at great length):

prolix

WordNet sense 4 (repetition of same sense in different words):

tautological, pleonastic, tautologic