1. Using exertion; employing labor; diligent in work or service; assiduous; used of persons; as a laborious husbandman or mechanic; a laborious minister or pastor.

2. Requiring labor; toilsome; tiresome; not easy; as laborious duties or services.

3. Requiring labor, exertion, perseverance or sacrifices.

Dost thou love watchings, abstinence or toil, laborious virtues all? Learn these from Cato.