| deep-rooted(adjective, fixed, persistent, continuous, lasting) |
| deep-seated(adjective, fixed, persistent, continuous, lasting) |
| direct(continuous, continual, uninterrupted, nonstop) |
| fixed(adjective, persistent, constant, continuous, endless) |
| great(adjective, vast, endless, immense, unlimited) |
| homogeneous(adjective, persistent, continuous, endless, relentless) |
| immeasurable(adjective, constant, abundant, unrestrained, endless) |
| incalculable(adjective, constant, abundant, unrestrained, endless) |
| inexhaustible(adjective, certain, reliable, trustworthy, endless) |
| inveterate(adjective, fixed, persistent, continuous, lasting) |
| level(adjective, continuous) |
| long(adjective, endless, incessant) |
| long-drawn-out(adjective, endless, incessant) |
| long-lived(adjective, persistent, continuous, lasting, continuing) |
| numberless(adjective, constant, abundant, unrestrained, immense) |
| overlong(constant, abundant, unrestrained, endless, immense) |
| prolonged(adjective, persistent, lasting, remaining) |
| rooted(adjective, persistent, continuous, lasting, continuing) |
| settled(adjective, persistent, continuous, lasting, continuing) |
| stable(adjective, steady, regular, persistent, even) |