This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

• Lexulous
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adj. Unrelenting; rigid.

adj. Uninviting or unnerving in aspect; forbidding: "undoubtedly the grimmest part of him was his iron claw” ( J.M. Barrie).

adj. Ghastly; sinister: "He made a grim jest at the horrifying nature of his wound” ( Reginald Pound). See Synonyms at ghastly.

adj. Dismal; gloomy: a grim, rainy day.

adj. Ferocious; savage: the grim advance of the pillaging army.

adj. dismal and gloomy, cold and forbidding

adj. rigid and unrelenting

adj. ghastly or sinister

adj. disgusting; gross

adj. Of forbidding or fear-inspiring aspect; fierce; stern; surly; cruel; frightful; horrible.

Of a fierce, stern, or forbidding aspect; severe or repellent in appearance or demeanor; fierce; sullen; surly.

Stern in character or quality; unyielding; dreadful; formidable: as, grim determination.

Marked by harshness or severity; distressful; dolorous; cheerless: as, grim suffering; a grim jest.

Synonyms Grisly, Hideous, etc. (see ghastly); severe, harsh, hard.

n. Anger; wrath.

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

adj. causing dejection

adj. not to be placated or appeased or moved by entreaty

adj. filled with melancholy and despondency

adj. harshly ironic or sinister

adj. shockingly repellent; inspiring horror

adj. harshly uninviting or formidable in manner or appearance

"Her dark curls were disheveled, her expression grim and making her look every one of her fifty-plus years."

depressing    cheerless    uncheerful    implacable    dejected    sarcastic    alarming    unpleasant   

grimmer    grimmest   

ghastly    sullen    sour    horrid    syn    ferocious    frightful    hideous    stern    grisly   

Grimm    Him    Im    Jim    Kim    Sim    Tim    Zim    brim    crim   

terrible    gloomy    solemn    stern    sinister    tragic