Use the adjective trying to describe an experience that is exasperating or difficult. Babysitting rascally kids for hours can be a trying ordeal.
If you've had a trying week, you'll be relieved and happy when Friday night finally arrives. Trying things can be upsetting, tricky, or strenuous. This word comes from a sense of the verb try that means "to make severe demands on a person, or on a person's patience." The first recorded use of trying was in the early 18th century.