What is the meaning of toilsome?

adjective

• Characterized by effort to the point of exhaustion; especially physical effort.
  • usage: "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"
  • synonyms: arduous, backbreaking, grueling, gruelling, hard, heavy, laborious, operose, punishing