Arduous/ˈɑːrdʒuəs/ Definition 1 of 2Pro Tip 1/3Physical Effort Often implies a task needs considerable physical strength or endurance. The arduous hike left us exhausted. Pro Tip 2/3Emotional Weight Can suggest an emotional challenge, not just physical or intellectual. Recovering from surgery is an arduous journey. Pro Tip 3/3Time Consuming Suggests tasks may take a lot of time to complete, often tediously. Completing this intricate puzzle is an arduous task.