WordNet (r) 3.0 (2006):

gangling
    adj 1: tall and thin and having long slender limbs; "a gangling
           teenager"; "a lanky kid transformed almost overnight into
           a handsome young man" [syn: gangling, gangly,
           lanky, rangy]
    2: tall and thin [syn: gangling, gangly, lanky]

Moby Thesaurus II by Grady Ward, 1.0:

37 Moby Thesaurus words for "gangling":
   bony, colossal, flat, flat-chested, fleshless, gangly, gaunt,
   gawky, giant, gigantic, lank, lanky, lean, lean-fleshed,
   lean-looking, leggy, lengthy, long, long-legged, meager, rangy,
   rawboned, scraggy, scrawny, skeletal, skinny, spare, spidery,
   spindling, spindly, statuesque, tall, thin-bellied, thin-fleshed,
   twiggy, undersized, underweight