Grum (?), a. [Cf. Dan. grum furious, Sw. grym, AS. gram, and E. grim, and grumble. √35.] 1. Morose; severe of countenance; sour; surly; glum; grim. “Nick looked sour and grum.” Arbuthnof.
2. Low; deep in the throat; guttural; rumbling; as, a grum voice.