undersized

from WordNet (r) 3.0 (2006)

undersized
    adj 1: smaller than normal for its kind [syn: {undersize},
           {undersized}]

from The Collaborative International Dictionary of English v.0.48

Undersized \Un"der*sized`\, a.
   Of a size less than is common.
   [1913 Webster]

from Moby Thesaurus II by Grady Ward, 1.0

58 Moby Thesaurus words for "undersized":
      Lilliputian, Tom Thumb, bantam, bony, dumpy, dwarf, dwarfed,
      dwarfish, elfin, flat, flat-chested, fleshless, gangling, gangly,
      gaunt, gawky, incipient, lank, lanky, lean, lean-fleshed,
      lean-looking, little, meager, midget, nanoid, petite, pygmy,
      rawboned, rudimental, rudimentary, runty, scraggy, scrawny,
      scrubby, short, shriveled, shrunk, shrunken, skeletal, skinny,
      slight, small, spare, spidery, spindling, spindly, squat, stunted,
      thin-bellied, thin-fleshed, tiny, twiggy, underdeveloped,
      undersize, underweight, undeveloped, wizened