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Permanent and or firmly established, such as one's opinions. Good luck getting him to listen to your political views—he's a dyed-in-the-wool liberal.
[of someone] permanent or extreme. My uncle was a dyed-in-the-wool farmer. He wouldn't change for anything. Sally is a dyed-in-the-wool socialist.
COMMON You use dyed-in-the-wool to describe a supporter of a particular set of beliefs or a member of a particular group, meaning that their beliefs or feelings are very strong and will never change. I'm a dyed-in-the-wool Labour man so he'll not get my vote. Mr Purves has made Hong Kong his home for the past 38 years but he remains a dyed-in-the-wool Scotsman. Michael is a dyed-in-the-wool traditionalist. Note: In medieval times, wool was often dyed before it was spun and woven. This meant that colour was more evenly distributed in the wool, and lasted longer.
dyed in the wool(of a person) completely and permanently fixed in a particular belief or opinion; inveterate.
If yarn is dyed in the raw state, it produces a more even and permanent colour.