arduous

Adjective
  1. Characterized by effort to the point of exhaustion;
    Especially physical effort (synset 300840083)
    "worked their arduous way up the mining valley"; "a grueling campaign"; "hard labor"; "heavy work"; "heavy going"; "spent many laborious hours on the project"; "set a punishing pace"
    similar to: effortful - requiring great physical effort
    same as: backbreaking, grueling, gruelling, hard, heavy, laborious, operose, punishing, toilsome
  2. Taxing to the utmost;
    Testing powers of endurance (synset 300841516)
    "his final, straining burst of speed"; "a strenuous task"; "your willingness after these six arduous days to remain here"
    similar to: effortful - requiring great physical effort
    same as: straining, strenuous
  3. Difficult to accomplish;
    Demanding considerable mental effort and skill (synset 300749470)
    "the arduous work of preparing a dictionary"
    similar to: difficult, hard - not easy; requiring great physical or mental effort to accomplish or comprehend or endure

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