grim

Harshly uninviting or formidable in manner or appearance.

“a grim man loving duty more than humanity”

“undoubtedly the grimmest part of him was his iron claw”

Causing dejection.

“grim rainy weather”

Not to be placated or appeased or moved by entreaty.

“grim determination”

“grim necessity”

Shockingly repellent; inspiring horror.

“the grim aftermath of the bombing”

“the grim task of burying the victims”

Filled with melancholy and despondency.

“took a grim view of the economy”

Harshly ironic or sinister.

“a grim joke”

“grim laughter”