O, yüzünde sinsi bir gülümsemeyle bana baktı.
 - She looked at me with a sly smile on her face.
Hancı sinsice sırıttı.
 - The innkeeper grinned slyly.
Sen kurnaz biri değil misin?
 - Aren't you the sly one?
With his natural slyness, he was able to talk his way out of trouble.