The Collaborative International Dictionary of English v.0.48:

Bulky \Bulk"y\, a.
   Of great bulk or dimensions; of great size; large; thick;
   massive; as, bulky volumes.
   [1913 Webster]

         A bulky digest of the revenue laws.      --Hawthorne.
   [1913 Webster]

WordNet (r) 3.0 (2006):

bulky
    adj 1: of large size for its weight

Moby Thesaurus II by Grady Ward, 1.0:

95 Moby Thesaurus words for "bulky":
   Gargantuan, adamantine, amplitudinous, astronomical, awesome,
   awkward, boundless, broad-bodied, bullnecked, chunky, clumsy,
   coarse, colossal, contrary, corpulent, cosmic, crass, crosswise,
   cumbersome, cumbrous, dense, durable, elephantine, enduring,
   enormous, extensive, fat, firm, full, full-bodied, galactic,
   gigantic, gross, hard, heavy, heavyset, huge, hulking, hulky,
   immeasurable, immense, impractical, inconvenient, infinite,
   king-size, large, lasting, lubberly, lumbering, lumpish, lumpy,
   mammoth, massive, massy, monster, monstrous, monumental,
   mountainous, outsize, overgrown, perverse, ponderous, prodigious,
   rugged, sizable, solid, sound, spacious, stable, steady, stout,
   strong, stupendous, sturdy, thick, thick-bodied, thickset,
   three-dimensional, titanic, tough, tremendous, ungainly, unhandy,
   unmanageable, unwieldy, unyielding, vast, viscous, voluminous,
   weighty, well-built, well-constructed, well-founded, well-grounded,
   well-made