| hanging tough(expression, adjective, usual, regular, resolute) |
| headstrong(adjective, tough, firm, careless, deliberate) |
| intractable(adjective, deliberate, fixed, resolute, persistent) |
| settled(verb, adjective, set, strong, easy) |
| standing pat(adjective, resolute, obstinate, uncompromising, unshakeable) |
| strong(adjective, good, hard, tough, easy) |
| devoted(adjective, good, strong, firm, honest) |
| purposeful(adjective, strong, tough, keen, firm) |
| strenuous(adjective, energetic, resolute, zealous) |
| strong-minded(adjective, resolution, fixed, courage, resolute) |
| untiring |
| ascertained(verb, proved, ascertained) |
| defined(verb, adjective, plain, precise, fixed) |
| exact(adjective, strong, severe, plain, definite) |
| hard(adjective, strong, tough, severe, harsh) |
| refractory(adjective, tough, firm, persistent, impulsive) |
| stalwart(adjective, strong, firm, solid, intense) |
| stern(adjective, resolute, persistent, rigid, obstinate) |
| true(adjective, good, clear, strong, tough) |
| unchangeable(adjective, strong, hard, definite, resolute) |