vallest (adjective) hard-shell: confirmed
Sinonime: accepted,
accustomed,
chronic, deep-rooted, deep-seated, dyed-in-the-wool,
entrenched, firmly established,
fixed, habituated, hardened, ineradicable,
ingrained, inured,
inveterate, irradicable, long-established,
proved,
seasoned,
set,
settled,
staid, val