| stiff(adjective, reliable, steadfast, loyal, faithful) |
| stout(adjective, reliable, steadfast, loyal, faithful) |
| sturdy(adjective, firm, solid, stable, fixed) |
| substantial(adjective, firm, solid, stable, fixed) |
| thirsty(adjective, keen, passionate, enthusiastic, fervent) |
| tough(adjective, reliable, steadfast, loyal, faithful) |
| true to life(expression, adjective, idiom, close, correct) |
| trust |
| unbending(adjective, resolute, persistent, dedicated, unwavering) |
| unchangeable(adjective, firm, solid, stable, fixed) |
| unfailing(adjective, true, reliable, trustworthy, dependable) |
| unfaltering(adjective, firm, solid, stable, fixed) |
| unfeigned(honest, pure, worthy, loyal) |
| unflagging(adjective, trustworthy, faithful) |
| unflinching(adjective, resolute, persistent, dedicated, unwavering) |
| unfluctuating(adjective, firm, solid, stable, fixed) |
| uniform(adjective, firm, solid, stable, fixed) |
| unmovable(adjective, resolute, persistent, dedicated, unwavering) |
| unqualified(adjective, firm, solid, stable, fixed) |
| unquestioning(adjective, firm, solid, intense, stable) |