grimly

“Good hunting,” said Kaa grimly, and glided away to the west wall.

Marilla intercepted the look and said grimly:

“She’ll stay in her room until she confesses,” said Marilla grimly, remembering the success of this method in the former case.

“I’ll settle Miss Anne when she comes home,” said Marilla grimly, as she shaved up kindlings with a carving knife and with more vim than was strictly necessary.