From The Collaborative International Dictionary of English v.0.48:

Grum \Grum\ (gr[u^]m), a. [Cf. Dan. grum furious, Sw. grym, AS.
   gram, and E. grim, and grumble. [root]35.]
   1. Morose; severe of countenance; sour; surly; glum; grim.
      "Nick looked sour and grum." --Arbuthnof.
      [1913 Webster]

   2. Low; deep in the throat; guttural; rumbling; as, a grum
      [1913 Webster]
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