Related Clues:

• Old American tyrant goes in for taxing
• Difficult individual to excite, being devoid of energy
• Difficult road with sharp bend - that's nothing, in Oz!
• Difficult, tiring
• Involving much effort
• Not easy to find couple in a hurry — husband's gone off
• Effortful
• After very little time, I found Wagner cycle wearisome
• Gosh! — getting hold of Bible — must be serious!
• Making great demands
• Hard to lift aggregate, cutting weight
• Difficult, troublesome
• Individual will need to get up shortly — not at all easy
• Extremely taxing
• Pair participating in a short run that's tiring