biggish, considerable, good, goodly, handsome, healthy, largish, major, respectable, significant, sizable(or sizeable), substantial, tidy

big, bulky, hefty, hulking, outsize(also outsized), oversize(or oversized), voluminousastronomical(also astronomic), bumper, colossal, elephantine, enormous, gigantic, great, herculean, huge, immense, jumbo, king-size(or king-sized), mammoth, massive, monstrous, monumental, prodigious, titanic, tremendous, whopping

inconsequential, inconsiderable, insignificant, insubstantial, negligible, nominal

measly, minute, paltry, petty, picayune, picayunish, piddling, puny, trifling, trivial, unimportantmarginal, meager(or meagre), slightlittle, small, tiny, undersized(also undersize)bitty, diminutive, miniature, pint-size(or pint-sized), pocket, pocket-size(also pocket-sized), pygmy, smallish