incurable

adjective
1
that cannot be cured
غیرقابل‌درمان, بی‌درمان, لاعلاج, درمان‌ناپذیر
opposite curable
2
that cannot be changed
غیرقابل‌تغییر, غیرقابل تغییر
She's an incurable optimist.
synonym incorrigible