sly
A. -adjective
slyer comparative
slyest superlative
1. (=wily) [person] astuto, taimado
·he'noun a sly one!
·¡es un zorro!
2. (=mischievous) [person] pícaro, travieso [look, smile] pícaro, malicioso
B. -noun
·[on] the sly
* a hurtadillas, a escondidas