adverb
in a way that is impossible to cure:
incurably ill
She was told that she was incurably ill.
The cancer had returned and spread incurably through her body.

adjective
that cannot be cured 不能治愈的
an incurable disease/illness
不治之症
OPP curable
that cannot be changed 不能改变的;无法矫正的 SYN incorrigible
She’s an incurable optimist.
她是个不可救药的乐天派。