I'm looking for an appropriate word for a certain kind of a smile.
Are you in love with that girl' asked she with a grin on her face.
I have used the word grin but I guess grin is a broad smile.
The situation here is the girl who is asking the question is in love with the guy. But she hasn't told him yet. She heard from someone that he likes someone else. So the degree of smile is actually a small smile which doesn't reveal much.