The Collaborative International Dictionary of English v.0.48:

Gawky \Gawk"y\ (g[add]k"[y^]), a. [Compar. Gawkier
   (g[add]k"[i^]*[~e]r); superl. Gawkiest.]
   Foolish and awkward; clumsy; clownish; as, gawky behavior. --
   n. A fellow who is awkward from being overgrown, or from
   stupidity, a gawk.
   [1913 Webster]

WordNet (r) 3.0 (2006):

gawky
    adj 1: lacking grace in movement or posture; "a gawky lad with
           long ungainly legs"; "clumsy fingers"; "what an ungainly
           creature a giraffe is"; "heaved his unwieldy figure out
           of his chair" [syn: gawky, clumsy, clunky,
           ungainly, unwieldy]

Moby Thesaurus II by Grady Ward, 1.0:

68 Moby Thesaurus words for "gawky":
   all thumbs, awkward, blunderheaded, blundering, bony, boorish,
   bumbling, bungling, butterfingered, careless, clownish, clumsy,
   clumsy-fisted, cumbersome, fingers all thumbs, flat, flat-chested,
   fleshless, fumbling, gangling, gangly, gauche, gaunt, gawkish,
   graceless, ham-fisted, ham-handed, heavy-handed, hulking, hulky,
   inelegant, lank, lanky, lean, lean-fleshed, lean-looking,
   left-hand, left-handed, loutish, lubberly, lumbering, lumpish,
   maladroit, meager, oafish, ponderous, rawboned, scraggy, scrawny,
   skeletal, skinny, sloppy, spare, spidery, spindling, spindly,
   splay, stiff, thin-bellied, thin-fleshed, twiggy, uncouth,
   undersized, underweight, ungainly, ungraceful, unhandy, unwieldy