excess, redundant, spare, supererogatory, superfluous, supernumerary, surplus

accessory, additional, supplemental, supplementary

de trop, dispensable, extraneous, gratuitous, needless, nonessential, uncalled-for, unessential, unnecessary, unneeded, unwanted

abundant, ample, bountiful, copious, plenteous, plentiful

deficient, inadequate, insufficient, meager (or meagre), poor, scant, scanty, scarce, short, shortish, skimpy, sparse

achingly, almighty, archly, awful, awfully, badly, beastly, blisteringly, bone, colossally, corking, cracking, damn, damned, dang, deadly, desperately, eminently, enormously, especially, ever, exceedingly (also exceeding), extremely, fabulously, fantastically, far, fiercely, filthy, frightfully, full, greatly, heavily, highly, hugely, immensely, incredibly, intensely, jolly, majorly, mightily, mighty, monstrous [chiefly dialect], mortally, most, much, particularly, passing, rattling, real, really, right, roaring, roaringly, seriously, severely, so, sore, sorely, spanking, specially, stinking, such, super, supremely, surpassingly, terribly, that, thumping, too, unco, uncommonly, vastly, very, vitally, way, whacking, wicked, wildly