unwearying

un- +‎ wearying

unwearying (comparative more unwearying, superlative most unwearying)

1. Untiring; not becoming tired.
   • 1813, Jane Austen, Pride and Prejudice, Volume I, Chapter 15,

     Mr. Collins repeated his apologies in quitting the room, and was assured with unwearying civility that they were perfectly needless.

   • 1908, Kenneth Grahame, The Wind in the Willows, Chapter 7,

     As a child that has fallen happily asleep in its nurse's arms, and wakes to find itself alone and laid in a strange place, and searches corners and cupboards, and runs from room to room, despair growing silently in its heart, even so Portly searched the island and searched, dogged and unwearying, till at last the black moment came for giving it up, and sitting down and crying bitterly.

   • 1915, Ezra Pound, “Poem by the Bridge at Ten-Shin” in Cathay, London: Elkin Mathews, p. 15,

     Night and day are given over to pleasure

     And they think it will last a thousand autumns,

     Unwearying autumns.

• inexhaustible, tireless, untiring, unflagging, indefatigable