свире́пость

nouninanimateuncountablerarenoun in -ь

1.
ferocity, fierceness, savagery, cruelty
Свире́пость хи́щника пугала всех в дере́вне.
The predator's ferocity frightened everyone in the village.
The most common use: the quality of being fierce and merciless.
2.
fury, rage, frenzy
Его свире́пость в ту мину́ту напуга́ла детей.
His fury at that moment frightened the children.
Of a momentary state of violent anger.
3.
fury, violence, harshness
Свире́пость моро́за заста́ла нас враспло́х.
The harshness of the frost caught us off guard.
Of storms, frost, the sea and the like.

Examples

Свирепость его взгляда пугала всех вокруг.
The fierceness of his gaze frightened everyone around him.
Он говорил о свирепости зимнего шторма.
He spoke about the ferocity of the winter storm.
Свирепость волка испугала охотников.
The wolf’s ferocity frightened the hunters.