The Collaborative International Dictionary of English v.0.48:

Overlarge \O"ver*large"\, a.
   Too large; too great.
   [1913 Webster]

WordNet (r) 3.0 (2006):

overlarge
    adj 1: excessively large [syn: overlarge, too large]

Moby Thesaurus II by Grady Ward, 1.0:

69 Moby Thesaurus words for "overlarge":
   a bit much, abandoned, aggrandized, amplified, ballyhooed,
   boundless, disproportionate, egregious, enormous, exaggerated,
   excessive, exorbitant, extravagant, extreme, fabulous, fancy,
   gigantic, gluttonous, grandiloquent, high, high-flown, hyperbolic,
   hypertrophied, immoderate, incontinent, inflated, inordinate,
   intemperate, magnified, monstrous, out of bounds, out of sight,
   outrageous, outsize, outsized, overbig, overdeveloped, overdone,
   overdrawn, overemphasized, overemphatic, overestimated, overfed,
   overgreat, overgrown, overmuch, overpraised, oversized, oversold,
   overstated, overstressed, overweening, overweight, overwrought,
   prodigal, profuse, puffed, steep, stiff, stretched, superlative,
   too big, too much, touted, unbridled, unconscionable, undue,
   unreasonable, unrestrained