1. Morose; surly; deep in the throat.

Nuttall's Standard dictionary of the English language By Nuttall, P.Austin

• grom,
• grue,
• gromm,
• grun,
• groam,
• grumme,
• vrum,
• yrum,
• g5um,
• gr7m,
• gruk,
• gfrum,
• vgrum,
• gvrum,
• bgrum,
• gbrum,
• hgrum,
• ygrum,
• Grummm,
• Graumm

The adjective form of "Grum" is "grumpy".

The plural form of the word "Grum" is "Grums".

The singular form of the word "Grum" is "Grum". The word does not change in its singular form.