The Collaborative International Dictionary of English v.0.48:

Lanky \Lank"y\, a.
   Somewhat lank; tall, thin, bony and ungraceful. --Thackeray.
   [1913 Webster]

         The lanky Dinka, nearly seven feet in height. --The
                                                  Century.
   [1913 Webster] Lanner

WordNet (r) 3.0 (2006):

lanky
    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]