dyed in the wool
坚定不移的，根深蒂固的
书面/口语·形容坚定不移
英文释义
firm or steadfast in one's beliefs or opinions, especially when it comes to a particular topic or ideology
例句
He's a dyed-in-the-wool conservative who never changes his political views.
典故来源
源自羊毛染色工艺，未纺前染色更持久，比喻信念或习惯根深蒂固、难以改变。