From The Collaborative International Dictionary of English v.0.48 :
Curly \Curl"y\ (k?rl"?), a.
Curling or tending to curl; having curls; full of ripples;
crinkled.
[1913 Webster]
From WordNet (r) 3.0 (2006) :
curly
adj 1: (of hair) having curls or waves; "they envied her
naturally curly hair" [ant: straight]