in·grained 
/ˈɪnˌgreɪnd/ adjective
/ˈɪnˌgreɪnd/ adjective [more ingrained; most ingrained] : existing for a long time and very difficult to change : firmly established
▪ an ingrained habit/tradition ▪ These attitudes are very deeply ingrained in the culture.
▪ an ingrained habit/tradition ▪ These attitudes are very deeply ingrained in the culture.
