| obstinate(adjective, tough, firm, intense, deliberate) |
| steady(adjective, firm, sensible, solid, intense) |
| unfaltering(adjective, firm, solid, intense, deliberate) |
| business-minded |
| devoted(adjective, keen, passionate, violent, enthusiastic) |
| opinionated(adjective, tough, firm, unreasonable, grim) |
| staunch(adjective, keen, firm, sensible, solid) |
| tireless |
| unswerving(adjective, firm, sensible, solid, intense) |
| obdurate(adjective, tough, firm, harsh, cruel) |
| set(adjective, firm, solid, steady, stable) |
| constant(adjective, firm, sensible, solid, steady) |
| decided(adjective, intense, deliberate, determined, serious) |
| fixed(adjective, tough, firm, solid, determined) |
| hell-bent(adjective, persistent, obstinate, insistent, dogged) |
| indefatigable |
| indomitable(adjective, hard, resolute, persistent, obstinate) |
| intent(adjective, firm, intense, deliberate, determined) |
| intractable(adjective, tough, firm, unreasonable, grim) |
| obsessed(adjective, firm, passionate, violent, determined) |