This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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adj. Morose, stern, surly.

adj. Morose; severe of countenance; sour; surly; glum; grim.

adj. Low; deep in the throat; guttural; rumbling.

Morose; surly; sullen; glum.

Low; deep in the throat; guttural: as, a grum voice.

"In the middle of the night, Shotgun oozed up onto the foot of the bed and sprawled out lazily, pushing me off to the side, grum-pling his annoyance that I was taking up so much room; every so often, he farted his opinion of the spaghetti sauce, then after a while he began snoring, a wheezing-whistling noise."

morose    sour    surly    glum    grim    low    guttural    rumbling    ill-tempered    sullen   

Brum    Krum    Mum    alum    become    brum    bum    chum    clum    come   

scandalmonger    unenlightening    bark-like    cushion-like    firm-featured    poachers'    witch-like    angellike    liver-coloured    walnut-shell