பொருள் : Characterized by effort to the point of exhaustion. Especially physical effort.
							எடுத்துக்காட்டு : 
							Worked their arduous way up the mining valley.
							A grueling campaign.
							Hard labor.
							Heavy work.
							Heavy going.
							Spent many laborious hours on the project.
							Set a punishing pace.
							
ஒத்த சொற்கள் : backbreaking, grueling, gruelling, hard, heavy, laborious, operose, punishing, toilsome
பொருள் : Difficult to accomplish. Demanding considerable mental effort and skill.
							எடுத்துக்காட்டு : 
							The arduous work of preparing a dictionary.