*snicker* From
WB's official description of Half-Blood Prince: "Lavender Brown has decided that Ron is the one for her, only she hadn’t counted on Romilda Vane’s chocolates! And then there’s Hermione, simpering with jealously but determined not to show her feelings."
Er, I think they mean SIMMERING with jealousy, LOL. There are few occasions where Hermione simpered at all, however I suppose if someone were going to pull off the previously unheard of task of simpering with jealousy, I'm sure she's quite capable. Brightest witch of her age, and all that.
Now where's that grammar icon when I need it?