ample

extra, supernumerary, surplus

abounding, blooming, overflowing, plump, replete, rich, rife, teeming, wealthy

adequate, enough, sufficient

fat, fecund, fertile, fruitful, luxuriant, prodigal, prolific

copious, fulsome, lavish, profuse

cavernous, voluminous

broad, wide

big, biggish, bulky, considerable, generous, goodly, grand, great, handsome, hefty, hulking, large, largish, outsize (also outsized), overscale (or overscaled), oversize (or oversized), sizable (or sizeable), substantial, tidy

Brobdingnagian, Bunyanesque, colossal, elephantine, enormous, gargantuan, gigantic, herculean, heroic (also heroical), Himalayan, huge, humongous (also humungous), immense, jumbo, king-size (or king-sized), leviathan, mammoth, massive, monolithic, monstrous, monumental, mountainous, pharaonic, prodigious, staggering, stupendous, super, titanic, tremendous

expansive, extended, extensive, vast

boundless, limitless, unbounded