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 arduous arduous /ˈɑːrdʒuːəs/

adjective

  1. () Characterized by effort to the point of exhaustion; especially physical effort  ( backbreaking , grueling [American] , gruelling [Canadian, British] , arduous , heavy , laborious , operose , punishing , toilsome , hard )
    characterized by effort to the point of exhaustion; especially physical effort
     Worked their arduous way up the mining valley
    worked their arduous way up the mining valley
     A grueling campaign
    a grueling campaign
     Hard labor
    hard labor
     Heavy work
    heavy work
     Heavy going
    heavy going
     Spent many laborious hours on the project
    spent many laborious hours on the project
     Set a punishing pace
    set a punishing pace
  2. Difficult to accomplish; demanding considerable mental effort and skill  ( arduous )
    difficult to accomplish; demanding considerable mental effort and skill
     The arduous work of preparing a dictionary
    the arduous work of preparing a dictionary
  3. Taxing to the utmost; testing powers of endurance  ( arduous , strenuous , straining )
    taxing to the utmost; testing powers of endurance
     His final, straining burst of speed
    his final, straining burst of speed
     A strenuous task
    a strenuous task
     Your willingness after these six arduous days to remain here
    your willingness after these six arduous days to remain here