non-refundable

adj. /ˌnɑːn rɪˈfʌndəbl/ B2

不可退款的

That cannot be returned or paid back.

仙境例句

“My hats are non-refundable,” said the Hatter, “so please choose very carefully.”

“我的帽子概不退款，”帽匠说，“所以请仔细挑。”