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Adjective: laborious  lu'bo-ree-us
  1. Characterized by effort to the point of exhaustion; especially physical effort
    "spent many laborious hours on the project";
    - arduous, backbreaking, grueling [US], gruelling [Brit, Cdn], hard, heavy, operose, punishing, toilsome, killing [informal]

See also: effortful

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Labor Secretary
labor union
laboratory
laboratory bench
laboratory coat
laboratory glassware
labored
laborer
laboring
labor-intensive
laborious
laboriously
laboriousness
laborsaving
labor-saving
Labour
labour
labour agreement
labour camp
labour coach
labour contract