backbreaking

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: arduous, grueling, gruelling, hard, heavy, laborious, operose, punishing, toilsome

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