large sizeable of considerable size substantial considerable great huge immense enormous extensive colossal massive mammoth vast prodigious tremendous gigantic giant monumental mighty stupendous gargantuan elephantine titanic epic mountainous megalithic monstrous Brobdingnagian towering tall high lofty outsize oversized overgrown cumbersome unwieldy inordinate unlimited goodly capacious voluminous commodious spacious good-size(d) fair-size(d) king-size(d) man-size family-size(d) economy-size(d) jumbo whopping whopping great thumping thumping great bumper mega humongous monster astronomical cosmic almighty dirty great socking great tidy whacking whacking great ginormous massy well built sturdily built heavily built sturdy brawny burly broad-shouldered muscular muscly well muscled robust rugged lusty Herculean bulky strapping thickset stocky solid hefty meaty fat stout portly plump heavy overweight oversize fleshy paunchy corpulent obese hunky hulking beefy husky buff stalwart thewy stark 2. important significant major of great import of significance momentous of moment weighty consequential of consequence far-reaching key