Laborious

Part of speech: adjective (a.)

1. Requiring labor, perseverance, or sacrifices; toilsome; tiresome. Dost thou love watchings, abstinence, or toil, Laborious virtues all Learn these from Cato. Addison.

2. Devoted to labor; diligent; industrious; as, a laborious mechanic. -- La*bo"ri*ous*ly, adv. -- La*bo"ri*ous*ness, n.