The Collaborative International Dictionary of English v.0.48:
Spindly \Spin"dly\, a. Long and slender, or disproportionately tall and slender; as, spindly legs.. Used in some cases to suggest weakness. Syn: spindling. [PJC]WordNet (r) 3.0 (2006):
spindly adj 1: long and lean [syn: lank, spindly]