名詞 antiphrasis:

1. the use of a word in a sense opposite to its normal sense (especially in irony)

an.tiph.ra.sis

n.（名詞）
The use of a word or phrase in a sense contrary to its normal meaning for ironic or humorous effect, as ina mere babe of 40 years.
反語法，詞語反用法：為表達(dá)出諷刺或幽默效果，使用的單詞或短語意義與一般意義相反，如不過是40歲的嬰兒

來源：
Late Latin
后期拉丁語
from Greek
源自 希臘語
from antiphrazein [to express by the opposite]
源自 antiphrazein [用相反意思表達(dá)]
anti- [anti-]
anti- [前綴，表示.反.，.抗.]
phrazein [to speak] * see phrase
phrazein [說] *參見 phrase