rozumnost znamená v angličtina

reasonableness▼(state or characteristic of being reasonable)
noun
[UK: ˈriːz.nəbl.nəs] [US: ˈriː.zə.nə.ˌbəl.nəs]

sanity▼(reasonable and rational behaviour)
noun
[UK: ˈsæ.nɪ.ti] [US: ˈsæ.nə.ti]