oxymoron

“活死人”这个词语是一个典型的矛盾修辞。

The term 'living dead' is a classic ___oxymoron.

她说自己是个'开朗的悲观主义者'，这真是个有趣的矛盾修辞。

She called herself a 'cheerful pessimist', which is a perfect ___oxymoron.