antithesis
🇺🇸
/ænˈtɪθəsɪs/
🇬🇧
/ænˈtɪθəsɪs/
Something that is completely different from another thing.
The antithesis of a loud party is a quiet library.
A situation where two things are very different from each other.
The antithesis of a sunny day is a rainy one.