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un- +‎ failing


unfailing (comparative more unfailing, superlative most unfailing)

  1. inexhaustible
  2. changeless, constant
    • 1894, Harper's New Monthly Magazine, volume 89, number 534, page 787:
      There is an unfailing charm about his novels, an unwearing freshness.
    • 2021 June 30, Tim Dunn, “How we made... Secrets of the London Underground”, in RAIL, number 934, page 51:
      It is a work of love, made in difficult times at complex locations, with the unfailing support of dozens of brilliant professional people.
  3. infallible