set in your ways
US /sɛt ɪn jʊər weɪz/
UK /sɛt ɪn jʊər weɪz/
1.
unwilling to change one's habits, opinions, or way of life
:
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My grandfather is very set in his ways and doesn't like new technology.
•
It's hard to teach an old dog new tricks, especially if they are set in their ways.