grim
adjective /ɡrɪm/
  /ɡrɪm/
(comparative grimmer, superlative grimmest)
Idioms - looking or sounding very serious
- a grim face/look/smile
 - She looked grim.
 - with a look of grim determination on his face
 - He set about the task with grim concentration.
 - grim-faced policemen
 
Extra Examples- There was a grim smile on her face as she approached.
 - They clung on to the edge of the boat with grim determination.
 
 - unpleasant and depressing
- James had some rather grim news.
 - We face the grim prospect of still higher unemployment.
 - Despite the grim forecast, the number of deaths was slightly down on last year.
 - The outlook is pretty grim.
 - This latest attack is a grim reminder of how vulnerable our airports are to terrorist attack.
 - Booth paints a grim picture of life in the next century.
 - a grim struggle for survival
 - Things are looking grim for workers in the building industry.
 - The accident serves as a grim reminder of what drinking and driving can do.
 
 - (of a place or building) not attractive; depressing
- The house looked grim and dreary in the rain.
 - the grim walls of the prison
 
 - [not before noun] (British English, informal) ill
- I feel grim this morning.
 
 - [not usually before noun] (British English, informal) of very low quality
- Their performance was fairly grim, I'm afraid!
 
 
Word OriginOld English, of Germanic origin; related to Dutch grim and German grimm.
Idioms 
hang/hold on for/like grim death (British English) 
(also hang/hold on for dear life North American English, British English)
- (informal) to hold somebody/something very tightly or keep something in a very determined way because you are afraid
- You get a job, then you get a mortgage and then you hang on like grim death to your job to pay off the mortgage.