| toilsome(adjective, hard, great, tough, difficult) |
| arduous(adjective, hard, great, tough, easy) |
| laborious(adjective, hard, great, tough, easy) |
| tough(adjective, great, easy, severe, rough) |
| hard(adjective, great, tough, easy, severe) |
| difficult(adjective, hard, great, tough, easy) |
| rising(adjective, climbing, ascending) |
| strenuous(adjective, hard, great, tough, severe) |
| onerous(adjective, great, tough, severe, difficult) |
| formidable(adjective, tough, severe, rough, difficult) |
| mounting(noun, adjective, rising, climbing, ascending) |
| stiff(adjective, tough, severe, difficult, grim) |
| troublesome(adjective, tough, severe, difficult, awkward) |
| up(adjective, adverb, preposition, earth, rising) |
| wearisome(adjective, tough, severe, difficult, awkward) |
| climbing(adjective, ascending) |
| rugged(adjective, hard, severe, rough, difficult) |
| upward(adverb, ascending) |
| acclivitous |
| burdensome(adjective, tough, severe, difficult, awkward) |