C1 adjective, noun /ˈkɑːr.dɪ.nəl/
cardinal
红衣主教 / 基本的
Meaning
As an adjective: of prime importance; as a noun: a high-ranking Catholic clergyman or a type of bird.
Example
Honesty is a cardinal virtue in life.
诚实是生活中的一种基本美德。