| purposeful(adjective, determined, serious, resolute, persistent) |
| putting on airs(expression, adjective, idiom, indifferent, detached) |
| realistic(adjective, reasonable, sensible, practical) |
| relentless(adjective, brutal, barbarous) |
| resolute(adjective, serious, persistent, unwavering, gritty) |
| resolved(adjective, serious, resolute, persistent, unwavering) |
| rigid(adjective, iron) |
| rigorous(adjective, harsh, grim, painful, bleak) |
| rugged(adjective, harsh, grim, painful, bleak) |
| ruthless(adjective, brutal, barbarous) |
| serious(adjective, resolute, persistent, unwavering, gritty) |
| set(adjective, serious, resolute, persistent, dogged) |
| set in stone(expression, adjective, idiom, firm, determined) |
| set on(expression, adjective, serious, resolute, persistent) |
| settled(adjective, serious, resolute, persistent, unwavering) |
| single-minded(adjective, serious, resolute, persistent, unwavering) |
| sober(adjective, reasonable, sensible, practical, realistic) |
| solid(adjective, serious, resolute, persistent, pat) |
| steadfast(adjective, serious, resolute, persistent, unwavering) |
| steely(adjective, stiff, brutal, hard-hearted, obdurate) |