| unchanged(adjective, fixed, unaffected, static, unvarying) |
| unvarying(adjective, calm, strong, secure, firm) |
| interminable(adjective, steady, persistent, constant, continuous) |
| dateless(adjective, steady, constant, continuous, lasting) |
| incessant(adjective, steady, stable, persistent, constant) |
| infinite(adjective, continuous, endless, boundless, everlasting) |
| perdurable(adjective, calm, strong, continue, sturdy) |
| sedentary |
| ageless(adjective, fixed, lasting, unchanging, unchangeable) |
| indelible(adjective, firm, true, fixed, constant) |
| inveterate(adjective, impulse, established) |
| irreversible(adjective, irrevocable) |
| irrevocable(adjective, fixed, unchangeable) |
| long-term(adjective, vast, lasting, lifelong, diurnal) |
| never-ending(adjective, constant, continuous, endless, infinite) |
| permanent wave(noun, expression, idiom, ponytail, perm) |
| regular(adjective, usual, steady, stable, routine) |
| sempiternal(adjective, eternal) |
| unfailing(steady, fixed, constant, continuous, frequent) |
| uninterrupted(adjective, steady, stable, regular, fixed) |