| wearing(adjective, hard, tough, rough, difficult) |
| wearying(adjective, tough, rough, difficult, heavy) |
| ambitious(tough, severe, painful, problematic, trying) |
| backbreaker(tough, severe, painful, problematic, trying) |
| bothersome(adjective, tough, severe, rough, difficult) |
| complicated(adjective, hard, tough, severe, rough) |
| contrived(adjective, true) |
| crucial(tough, severe, painful, problematic, trying) |
| crushing |
| deep |
| difficile(adjective, tough, severe, rough, difficult) |
| distressing(adjective, tough, rough, difficult, harsh) |
| dragging |
| easier said than done(expression, tough, severe, painful, problematic) |
| effort |
| exigent(adjective, heavy) |
| fatiguing(adjective, hard, tough, rough, difficult) |
| galling(tough, severe, painful, problematic, trying) |
| gargantuan(tough, severe, painful, problematic, trying) |
| grinding(adjective, tough, rough, difficult, harsh) |