Synonyms of hard-shell

1 Syllable
set, staid, stern, val
2 Syllables
headstrong, proved, sterner, settled, fixed, hardshell, chronic, sternest
3 Syllables
hardened, deep-rooted, deep-seated, entrenched, ingrained, inured, seasoned, accepted, confirmed
4 Syllables
accustomed, dyed-in-the-wool, habituated
5 Syllables
inveterate, irradicable, long-established
6 Syllables
ineradicable