grimly

Grim-looking, grim-natured.

To hear her rant, one would have supposed, who had not seen him, that her lank-haired, grimly partner, was the prettiest youth in the county of Dublin, and that all the comely lasses in Chapelizod and the country round were sighing and setting caps at him […]

In reality it was the most terrifying sight I had seen to date: two fried eggs decorated with ketchup, Tabasco and chopped chillis in the semblance of a pair of bloodshot eyes – I would as soon have eaten my own leg. I waved the grimly thing away.

In a grim manner.

He looked round and shouted grimly, "As soon as the gate is opened, you go out there - running."

I looked out my window / The cloud was grimly forming / Waiting for the rain I saw / The one dark cloud forming