| chronic(adjective, fixed, established, confirmed) |
| confirmed(adjective, fixed, established, inveterate) |
| deep-rooted(adjective, fixed, established, confirmed) |
| deep-seated(adjective, fixed, established, confirmed) |
| dyed-in-the-wool(adjective, fixed, established, confirmed) |
| entrenched(adjective, fixed, established, confirmed) |
| firmly established(expression, adjective, fixed, established) |
| fixed(adjective, usual, conventional, customary) |
| ingrained(adjective, fixed, established, confirmed) |
| inveterate(adjective, familiar, fixed, established) |
| settled(adjective, fixed, established, confirmed) |
| accepted(adjective, usual, fixed, conventional) |
| accustomed(adjective, regular, fixed, established) |
| habituated(adjective, fixed, established, confirmed) |
| hard-shell(adjective, fixed, established, confirmed) |
| hardened(adjective, familiar, fixed, established) |
| ineradicable(adjective, fixed, confirmed) |
| inured(adjective, fixed, established, confirmed) |
| proved(adjective, fixed, established, confirmed) |
| seasoned(adjective, fixed, established, confirmed) |