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Definition of sizable : 1. Being of reasonable or suitable size; as, sizable timber; sizable bulk.
2. Of considerable size or bulk.

Synonyms:

levelheaded, good, intelligent, major, kempt, goodish, biggish, estimable, respectable, considerable, level-headed, sizeable, goodly, king-size, plentiful, good for you, sinewy, hefty, tidy, boxcar, healthy, powerful, muscular, substantive, sound, outsize, plenteous, handsome, salubrious, hulking, honorable, rich, largish, large-scale, significant, brawny, oversize, substantial, husky

extensive, roomy, ample, large, lofty, colossal, soaring, magnificent, generous, enormous, big, voluminous, humongous, great, copious, awesome, giant, gargantuan, expansive, baggy, impressive, bulky, capacious, immense, towering, grand, cavernous, majestic, comprehensive, tremendous, princely, prodigious, vast, mammoth, huge, elephantine, gigantic, massive, spacious, grandiose

corpulent, long, amplitudinous, wide, high, chunky, broad, portly, dimensional, measurable

Usage examples:

• " In this country, Frances, a sheriff is a pretty sizable man," he said, his thoughtful eyes on the fire, " about the biggest man they can conceive, next only to the president himself. - "The Rustler of Wind River", G. W. Ogden.
• Far below me a sizable stream here showed itself through the tropical vegetation as it hurried down to a hidden cove. - "Foe-Farrell", Arthur Thomas Quiller-Couch.
• As he spoke he opened a sizable door. - "Foes", Mary Johnston.