Webster's English Dictionary

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grim

grim \'grim\ aj or grim.mer;  or grim.mest [ME, fr. OE grimm; akin to OHG 
   grimm fierce, Gk chromados act]ion of gnashing 1: SAVAGE, FIERCE  2a: of 
   harsh and forbidding aspect  2b: ghastly, repellent, or sinister in 
   character  - grim.ly av