WordNet (r) 3.0 (2006):

bowlegged
    adj 1: have legs that curve outward at the knees [syn: bandy,
           bandy-legged, bowed, bowleg, bowlegged]

Moby Thesaurus II by Grady Ward, 1.0:

37 Moby Thesaurus words for "bowlegged":
   bandy, bandy-legged, bent, blemished, bloated, bowed, club-footed,
   crooked, curved, defaced, deformed, disfigured, dwarfed,
   flatfooted, grotesque, ill-made, ill-proportioned, ill-shaped,
   knock-kneed, malformed, marred, misbegotten, misproportioned,
   misshapen, monstrous, mutilated, out of shape, pigeon-toed,
   pug-nosed, rachitic, rickety, simous, snub-nosed, stumpy,
   swaybacked, talipedic, truncated