unflagging

From un- + flagging.

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unflagging (comparative more unflagging, superlative most unflagging)

1. Never tiring or lacking energy; without rest; without slowing.

   His unflagging efforts have not gone unnoticed.

   • 1930, Norman Lindsay, Redheap, Sydney, N.S.W.: Ure Smith, →OCLC, page 122:

     He went on kissing her with unflagging industry, while she remained limply in his arms, in a species of satisfied trance.

   • 1959 May, “New Reading on Railways: British Railways Today and Tomorrow. By G. Freeman Allen. Ian Allan. 25s.”, in Trains Illustrated, page 271:

     He writes of locomotive design, maintenance, passenger timetables, the structure of freight services, supervision and organisation, with unflagging enthusiasm, which comes across to us in a most readable book.

   • 2008, Karlyn Kohrs Campbell with Susan Schultz Huxman, The Rhetorical Act: Thinking, Speaking and Writing Critically‎^[1], page 265:

     The 2001 photo was strangely and powerfully similar to the World War II flag raising because both photos captured a heroic deed of courage, grit, teamwork, and unflagging patriotism at a historic moment marked by the darkness of the threat against us.

   • 2023 February 20, Eliot A. Cohen, quoting Joe Biden, “Biden Just Destroyed Putin’s Last Hope”, in The Atlantic‎^[2]:

     His words mattered. He pledged “our unwavering and unflagging commitment to Ukraine’s democracy, sovereignty, and territorial integrity.”

• inexhaustible, tireless, untiring, unwearying, indefatigable