| impressive(adjective, strong, powerful) |
| leviathan |
| mastodonic(adjective, big, giant) |
| monster(adjective, big, size) |
| rough(adjective, tough, difficult, heavy, awkward) |
| severe(adjective, tough, rough, difficult, heavy) |
| stalwart(strong, strength, solid, vigorous, sturdy) |
| stiff(adjective, tough, severe, difficult, painful) |
| tiring(adjective, tough, rough, difficult, heavy) |
| towering(adjective, huge, vast, immense, copious) |
| uphill(adjective, tough, severe, difficult, awkward) |
| vasty |
| wearisome(adjective, tough, severe, difficult, awkward) |
| wearying(adjective, tough, rough, difficult, heavy) |
| Moby |
| abundant |
| ambitious(tough, severe, painful, problematic, trying) |
| ample |
| backbreaker(tough, severe, painful, problematic, trying) |
| bothersome(adjective, tough, severe, rough, difficult) |