This is the 898th most frequent Czech word.
životního
"Životního" means "of life" or "life's" in English.
Here, 'životního' also functions as an attributive adjective in its genitive singular form, defining 'prostředí' as 'environment' linked to life or natural living conditions.
Ochrana životního prostředí je důležitá.
Protection of the environment is important.
In this sentence, 'životního' is the genitive singular form of 'životní', functioning as an attributive adjective modifying 'stylu' to specify the context as 'lifestyle'.
Pro zlepšení svého životního stylu začal cvičit.
To improve his lifestyle, he started exercising.
In this example, 'životního' modifies 'cyklu' to describe it as a 'life cycle,' reflecting the genitive singular attribution in this context.