Related Clues:
- Arduous
- Difficult
- Demanding
- Tedious
- Laborious
- Requiring great effort
- Strenuous
- Taxing
- For strength you want to make a fort for it, by the sound of it
- It was an effort for the ten of us to get so sour
- Heavy smell found in large city in Australia
- Needing forceful exertion
- Physically demanding
- Involving hard work
- Boat halfway between two cities put down American pedestrian