Operose
Part of speech: adjective
Definition: Wrought with labor; requiring labor; hence, tedious; wearisome.
Laborious
Part of speech: adjective
Definition: Requiring much physical effort; toilsome.Mentally difficult; painstakingIndustrious.
Example sentence: The doubt of an earnest, thoughtful, patient and laborious mind is worthy of respect. In such doubt may be found indeed more faith than in half the creeds.