Extremely difficult to endure Crossword Clue

Hello all crossword hunters!

Please find today's clue from the given "Irish Times (Simplex)" puzzle. "Extremely difficult to endure" Check the clue first and find the hints hidden in the puzzle.
Let us gather the related details that will help us find the correct answer to the crossword puzzle. Then we will make a list of the possible answers for the "Extremely difficult to endure" clue here below.

Best Answer: SEVERE
Crossword Date3 October 2017