to the core (adjective) dyed-in-the-wool: deep-rooted
Sinonime: absolute,
complete,
confirmed,
congenital, deep-down, deep-dyed, deep-rooted, deep-seated, deeply ingrained, die-hard,
entrenched,
fixed, full-fledged,
genuine, hardened, infixed,
ingrained, instilled, long-standing, out and out,
thorough, thoroughgoing, through and through, to the core, to the core,
true, unchangeable,
uncompromising,
utter, well-established