antithetical

US /ˌæn.t̬əˈθet̬.ɪ.kəl/
UK /ˌæn.t̬əˈθet̬.ɪ.kəl/
1.

phản nghĩa

exactly the opposite of someone or something or of each other:

:
•
The idea that science is antithetical to the arts is wrong.