Requiring great physical or mental effort; difficult to accomplish; strenuous
Let's find possible answers to "Requiring great physical or mental effort; difficult to accomplish; strenuous" crossword clue. First of all, we will look for a few extra hints for this entry: Requiring great physical or mental effort; difficult to accomplish; strenuous. Finally, we will solve this crossword puzzle clue and get the correct word. We have 1 possible solution for this clue in our database.
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