Grum adjective [ Confer Danish grum furious, Swedish grym , Anglo-Saxon gram , and English grim , and grumble . √35.] 1. Morose; severe of countenance; sour; surly; glum; grim. 'Nick looked sour and grum .' Arbuthnof. 2. Low; d... Found on http://www.encyclo.co.uk/webster/G/63