Indefatigability

Indefatigability means an inability to be easily tired out, physically, mentally, or emotionally. It’s the quality of continuing with energy and determination even when circumstances are draining. Unlike short bursts of motivation, indefatigability isn’t about enthusiasm alone; it’s about endurance.

Imagine a river flowing around rocks. It doesn’t argue with obstacles or try to overpower them all at once. It simply keeps moving, day after day, shaping the landscape. That quiet persistence is indefatigability. It’s not the absence of exhaustion, but the refusal to let exhaustion be the final word.
[Economic Times]