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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

See also: effortful, labor [US], laboriously, laboriousness

Nearest

labor resources
Labor Secretary
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laboratory coat
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laborer
laboring
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laboriously
laboriousness
laborsaving
labour
Labour
labour agreement
labour camp
labour coach
labour contract
Labour Day