| crucial(tough, severe, painful, problematic, trying) |
| demanding(adjective, tough, severe, painful, problematic) |
| difficile(tough, severe, painful, problematic, trying) |
| easier said than done(expression, tough, severe, painful, problematic) |
| effortful(tough, severe, painful, problematic, trying) |
| exacting(tough, severe, painful, problematic, trying) |
| fastidious(adjective, tough, problematic, trying) |
| finicky(adjective, tough, problematic, trying) |
| first |
| forward of |
| galling(tough, severe, painful, problematic, trying) |
| gargantuan(tough, severe, painful, problematic, trying) |
| go up |
| grow up |
| hard-won(tough, severe, painful, problematic, trying) |
| heavy(tough, severe, painful, problematic, trying) |
| herculean(tough, severe, painful, problematic, trying) |
| higher(adjective, top, high, over, up) |
| higher-ranking(adjective, top, high, over, up) |
| immense(tough, severe, painful, problematic, trying) |