glaring

Take off thine eye! more intolerable than fiends' glarings is a doltish stare!

Leonard: You’re clearly upset about Amy being gone, and you’re trying to replace her with a bunch of cats.

Sheldon: Clowder.

Leonard: What?

Sheldon: A group of cats is a clowder. Or a glaring. It’s the kind of thing you ought to know now that we have one.