untiring

He has long been encouraged to aim toward concision, especially in his longer numbers, in which his untiring improvisations can become exhausting in their many climaxes.

He was awarded the Nobel Peace Prize in 2002 for “decades of untiring effort to find peaceful solutions to international conflicts” and to advance democracy and human rights.

“Such enthusiasm!—the whole battalion with helmets and tunics decked with flowers—handkerchiefs waving untiringly—cheers on every side....This hour is one such as seldom strikes in the life of a nation.”

Carter’s Nobel citation honored “his decades of untiring effort” to resolve conflicts, promote democracy and foster economic development.

Carter won in 2002 in part for his "untiring effort to find peaceful solutions to international conflicts."