chickening out (verb) chicken out: back down
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