fatigued

This term carries a heavier weight than "tired," suggesting a state of total depletion where recovery requires significant rest. In a human context, it often implies a cumulative exhaustion resulting from prolonged effort or chronic stress, rather than a momentary lack of sleep.

When applied to materials, the word describes a specific technical phenomenon where structural integrity is compromised by cyclic loading. This usage is common in engineering and metallurgy to describe the gradual development of microscopic cracks that lead to sudden failure, distinguishing it from general wear and tear.