unflagging

• All were tired but unflagging, and Mrs. Bradley, not for the first time, admired without stint the soldierly courage and cheerfulness of the religious, as, impeded, one would suppose, by their habits, stumbling often in the unevenness of the way, they carried out the thorough, patient search. —  When Last I Died - Gladys Mitchell - Bradley 13: 1941
• Those who had courage and clear vision, who loved justice, who were patient and humble and unflagging, and who believed with an ineluctable conviction that righteousness exalteth a nation; they were the simple fishermen who in the little church at Torcello predicted the splendor and power of Venice; they were the stern pioneers of Plymouth and Boston who laid the foundations of an empire greater than that of Rome. —  George Washington
• This concert, with the Steve Wilson Quartet, will showcase his knack for solid composition and unflagging, airtight improvisation, and he will premiere a new work commissioned by the Center.
• Manzi said he thinks that Flegge will also be remembered for his unflagging energy and his involvement in the lives of his parishioners.
• Miller reiterated his unflagging support for state Sen. Mark DeSaulnier of Concord. —  Swing State Project

Roget's II: The New Thesaurus

Used in the Same Context