Definition of big :
1. Great with young; pregnant; swelling; ready to give birth or produce; - often figuratively.
2. Having greatness, fullness, importance, inflation, distention, etc., whether in a good or a bad sense; as, a big heart; a big voice; big looks; to look big. As applied to looks, it indicates haughtiness or pride.
3. Having largeness of size; of much bulk or magnitude; of great size; large.
bragging, free, momentous, thumping, bounteous, youth, spectacular, healthy, astronomical, double, defective, monumental, largish, monolithic, good, outstanding, magnanimous, pompous, big-hearted, extended, declamatory, large-hearted, crowing, large-scale, gravid, of import, larger, turgid, risky, brimming, biggest, lifesize, obvious, expectant, sorry, pretentious, wide-ranging, presumptuous, proud, high-risk, bombastic, greathearted, fully grown, commodious, loud, cock-a-hoop, important, give, prominent, outsized, mountainous, elder, boastful, gone, historic, developed, brimful, super, expecting, tough, parturient, greatest, queen-sized, bad, unfit, openhanded, braggy, self-aggrandizing, macro, intense, cosmic, rangy, largest, larger-than-life, bighearted, grownup, giving, regretful, plentiful, handsome, tidy, king-sized, imperious, jumbo, loose, rich, bouffant, well-favored, puffy, salient, mature, pompously, overflowing, deep, titanic, monstrous, oversized, whacking, plumping, coarse, swelled, significant, walloping, ostentatiously, too large, speculative, overlarge, great-hearted, meaningful, awash, outsize, volumed, considerable, full-grown, full-blown, unsound, adult, pregnant, bountiful, hulky, striking, whopping, boastfully, egotistic, bigger, vauntingly, ripe, biggish, queen-size, freehand, fine-looking, enlarged, oversize, uncollectible, man-sized, substantial, vainglorious, epic, large-minded, better-looking, stupendous, abundant, tumid, full-size, grown-up, king-size, material, full-fledged, heavy, heroic, grown, freehanded, liberal, self-aggrandising, spoilt, hulking, blown-up, conspicuous, sizeable, pornographic, forged, with child, tolerant, astronomic, enceinte, life-size, good-looking, reproduction, life-sized, well-favoured, braggart, banner, orotund, galactic, spoiled
important (part of speech: adjective)
generous (part of speech: adjective)
large (part of speech: adjective)
gargantuan, sizable, ample, lofty, magnificent, comprehensive, soaring, majestic, giant, expansive, bulky, voluminous, immense, huge, elephantine, awesome, gigantic, generous, extensive, baggy, large, capacious, cavernous, impressive, towering, grandiose, colossal, mammoth, copious, tremendous, prodigious, roomy, vast, massive, humongous, enormous, grand, princely, spacious, great
loud (part of speech: adjective)
size (part of speech: adjective)