This is the 5086th most frequent Russian word.
морозная
Frosty.
Here, 'морозная' is used as an adjective to describe the noun 'погода' (weather), indicating that the conditions are cold and frosty.
Сегодня утром была морозная погода.
This morning, the weather was frosty.
In this sentence, 'морозная' describes the noun 'тишина' (silence), metaphorically depicting the chilled, still atmosphere of the forest.
Морозная тишина стояла в лесу.
A frosty silence stood in the forest.
Here, 'морозной' is an adjective modifying 'зимы' (winter), emphasizing the cold and frosty characteristics of the season.