synonyms for difficult

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Across
  1. 1. Staying up all night is rather..
  2. 6. Telling the truth can sometimes be ...
  3. 8. Yesterday's Maths was rather...(c)
  4. 10. The surgeon's 14 hour shift was...
Down
  1. 2. Running a marathon can be ...(g)
  2. 3. Toddlers' tantrums can be ...for parents
  3. 4. Doing something for the first time can be.(d)
  4. 5. The jusge handed down a ...sentence
  5. 7. Having lots of things go wrong is a bit..
  6. 9. The soldiers fought in .... conditions