Wordnet 3.0
NOUN (1)
1.
a tall and thin physique;
The Collaborative International Dictionary of English v.0.48:
Lankiness \Lank"i*ness\, n.
The condition or quality or being lanky.
[1913 Webster]
WordNet (r) 3.0 (2006):
lankiness
n 1: a tall and thin physique