antonymous

adj. /ænˈtɑːnɪməs/ C2

反义的

Having a meaning opposite to another word.

仙境例句

Laughing and Grief are antonymous words, yet one old crab taught them both.

“笑”和“悲伤”意思正好相反，可这两门课竟是同一只老螃蟹教的。