- Arduous
- Burdensome
- Condone Rousseau’s secret taxing
- One has right to head off IOUs when they become burdensome
- Taxing
- Burdensome; oppressive.
- Daring (someone)
- Daring (to)
- Demanding
- Laughable
- Taxing (task)
- Throwing down the gauntlet can be difficult
- of Challenge
- Gruelling
- Severely taxing
- of Punish
- Mentally taxing
- of Test
- The act of testing or proving; trial; proof.
- The operation of refining gold or silver in a test, or
cupel; cupellation.