self-damning

adjective

self-damn·​ing ˌself-ˈda-miŋ 

1

: causing or leading to one's own condemnation or ruin

his self-damning testimony

2

: condemning or criticizing oneself

negative, self-damning thoughts

is self-damning about his flaws

Bernard Gallacher has long been his own most voluble critic. Nothing any observer could say would match his self-damning assessment of the defeat …

—Ian Paul

Word History

First Known Use

1683, in the meaning defined at sense 1