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 a grim manner.
He looked round and shouted grimly, "As soon as the gate is opened, you go out there - running."
From Middle English grymly, grimlich, from Old English grimmliċ, corresponding to grim + -ly. Compare grimlike.
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