Adjective:
1: voluminous, jumbo, hulky, titanic, immense, man-sized, large-mouthed, large-scale, stupendous, massive, overlarge, wide-ranging, biggish, vast, plumping, volumed, full-size, king-size, life-sized, too large, lifesize, whacking, great, wide, ample, epic, humongous, colossal, prodigious, queen-size, outsized, large, bouffant, spacious, queen-sized, brobdingnagian, grand, macro, sizable, enormous, bigger, oversized, monumental, giant, largish, deep, super, extended, bear-sized, big, large-scale, broad, hulking, outsize, gigantic, puffy, elephantine, cosmic, larger-than-life, double, heroic, massive, bulky, medium-large, king-sized, mammoth, life-size, whopping, astronomical, rangy, enlarged, astronomic, mountainous, sizeable, oversize, huge, galactic, extensive, thumping, walloping, banging, tremendous, larger, gargantuan, capacious, monolithic, monstrous, blown-up above average in size or number or quantity or magnitude or extent; "a large city"; "set out for the big city"; "a large sum"; "a big (or large) barn"; "a large family"; "big businesses"; "a big expenditure"; "a large number of newspapers"; "a big group of scientists"; "large areas of the world"
2: important, big, of import significant; "graduation was a big day in his life"
3: conspicuous, big, large, prominent conspicuous in position or importance; "a big figure in the movement"; "big man on campus"; "he's very large in financial circles"; "a prominent citizen"
4: big, bad, intense very intense; "a bad headache"; "in a big rage"; "had a big (or bad) shock"; "a bad earthquake"; "a bad storm"
5: loud, big loud and firm; "a big voice"; "big bold piano sounds"
6: big, intemperate, heavy prodigious; "big spender"; "big eater"; "heavy investor"
7: grownup, mature, grown, big, adult, full-grown, fully grown (of animals) fully developed; "an adult animal"; "a grown woman"
8: big, heavy marked by intense physical force; "a big wind"
9: swelled, big, vainglorious, proud feeling self-importance; "too big for his britches"; "had a swelled head"; "he was swelled with pride"
10: cock-a-hoop, self-aggrandising, proud, braggart, boastful, braggy, self-aggrandizing, bragging, crowing, big exhibiting self-importance; "big talk"
11: generous, magnanimous, large, big generous and understanding and tolerant; "a heart big enough to hold no grudges"; "that's very big of you to be so forgiving"; "a large and generous spirit"; "a large heart"; "magnanimous toward his enemies"
12: handsome, openhanded, giving, bountiful, bighearted, big, freehanded, generous, bounteous, liberal given or giving freely; "was a big tipper"; "the bounteous goodness of God"; "bountiful compliments"; "a freehanded host"; "a handsome allowance"; "Saturday's child is loving and giving"; "a liberal backer of the arts"; "a munificent gift"; "her fond and openhanded grandfather"
13: with child, pregnant, heavy, large, big, expectant, great, enceinte, gravid in an advanced stage of pregnancy; "was big with child"; "was great with child"
Adverb:
1: big extremely well; "his performance went over big"
2: large, boastfully, vauntingly, big in a boastful manner; "he talked big all evening"
3: big on a grand scale; "think big"
4: big in a major way; "the play failed big at the box office"