dyed-in-the-wool in Russian
dyed-in-the-wool in Russian
бескомпроми́ссный
(idiomatic, figuratively, of a person) Firmly established in one's beliefs or habits; having a specified characteristic, identity, etc. deeply ingrained in one's nature.
закорене́лый
(idiomatic, figuratively, of a person) Firmly established in one's beliefs or habits; having a specified characteristic, identity, etc. deeply ingrained in one's nature.