This is the 13024th most frequent Russian word.
лютую
"Лютую" means "I am raging" or "I am furious" in English.
The word 'лютую' here is used as a verb derived from 'лютовать', indicating being fiercely angry or raging.
Я лютую, когда вижу несправедливость.
I rage when I see injustice.
The word 'лютую' modifies 'зиму' as an adjective, emphasizing the severity or harshness of the winter (feminine gender).
Она лютую зиму пережила с мужеством.
She endured the fierce winter with courage.
The word 'лютую' is used as an adjective modifying 'медведица', describing the bear as being fierce, fierce or formidable (feminine gender).