sly
US /slaɪ/
UK /slaɪ/

1.
2.
malicioso, discreto
suggesting or characterized by a secret, knowing look or manner
:
•
She gave him a sly wink across the room.
Ela lhe deu uma piscadela maliciosa do outro lado da sala.
•
There was a sly smile on his face, suggesting he knew more than he let on.
Havia um sorriso malicioso em seu rosto, sugerindo que ele sabia mais do que demonstrava.