| bold(adjective, resolute, tenacious) |
| changeless(adjective, stable, resolute, constant, dedicated) |
| decided(adjective, firm, intense, deliberate, determined) |
| everlasting(adjective, continue, steady, stable, constant) |
| importunate(adjective, continue, demanding, insistent) |
| long-lasting(adjective, tough, continue, sturdy, constant) |
| long-lived(adjective, continue, continuous, hardened, lasting) |
| non-stop |
| repetitive(adjective, continuous) |
| strong-willed(adjective, strong, tough, firm, intense) |
| unbroken(adjective, severe, pure, steady, regular) |
| undaunted(adjective, tenacious) |
| adamant(adjective, strong, tough, flat, firm) |
| confirmed(adjective, usual, steady, regular, routine) |
| continued(adjective, strong, firm, determined, steady) |
| dedicated(adjective, strong, firm, determined, steady) |
| demanding(adjective, firm, obstinate, insistent, dogged) |
| haunting(adjective, lasting, remaining) |
| inexorable(adjective, tough, determined, unreasonable, grim) |
| intent(adjective, strong, flat, intense, certain) |