Related Clues:
- Requiring much effort
- It's hard to make such a dour mixture with us
- Work that's so hard may make one dour in the USA
- Gruelling, strenuous
- A right pair - useless and exhausting
- A right pair America finds steep
- Heavy smell found in large city in Australia
- Difficult to do
- Steep — hard
- Tough to accomplish
- Involving hard work
- Requiring hard work
- Fatiguing (task)
- Steep; laborious
- Boat halfway between two cities put down American pedestrian