grim

Short definition from Wiktionary

Adjective

1. 1
   Dismal and gloomy, cold and forbidding.
2. 2
   Rigid and unrelenting.
3. 3
   Ghastly or sinister.
4. 4
   Disgusting; gross.
5. 5
   Fierce, cruel, furious.

Verb

1. 1
   To make grim; to give a stern or forbidding aspect to.

Noun

1. 1
   A promiscuous woman.
2. 2
   Anger, wrath.
3. 3
   A specter, ghost, haunting spirit.

Proper noun

1. 1
   An English surname