self-evident
🇺🇸
/ˌself ˈevɪdənt/
🇬🇧
/ˌself ˈevɪdənt/
Something that is very clear and easy to understand, without needing any more information or proof.
It is self-evident that smoking is harmful to our health.
たばこを吸うことが健康に有害であることは自明です。