| ardent(adjective, firm, solid, stable, fixed) |
| certain(adjective, firm, solid, stable, fixed) |
| changeless(adjective, firm, solid, stable, fixed) |
| committed(determined, steady, resolute, even, unchanging) |
| consistent |
| cool(adjective, firm, solid, stable, fixed) |
| dedicated |
| demanding(adjective, severe, stiff, rigid, tight) |
| determined |
| dogged |
| immovable(adjective, firm, solid, stable, fixed) |
| imperturbable(adjective, firm, solid, stable, fixed) |
| inflexible(adjective, severe, stiff, rigid, tight) |
| intense(adjective, firm, solid, steady, stable) |
| ironfisted(adjective, stiff, strict, demanding, dogged) |
| levelheaded(adjective, firm, solid, stable, fixed) |
| liege(adjective, firm, solid, stable, fixed) |
| long-standing(steady, even, unchanging) |
| loyal(adjective, firm, solid, stable, fixed) |
| never-failing(adjective, firm, solid, steady, substantial) |