Hancı sinsice sırıttı.
- The innkeeper grinned slyly.
O, yüzünde sinsi bir gülümsemeyle bana baktı.
- She looked at me with a sly smile on her face.
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.