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1580s, originally a variant of metal, which had a figurative sense until the early 18th century.[1]



mettle (usually uncountable, plural mettles)

  1. A quality of endurance and courage.
    Synonyms: courage, heart, spirit
    • 1599, William Shakespeare, “The Life of Henry the Fift”, in Mr. William Shakespeares Comedies, Histories, & Tragedies [] (First Folio), London: [] Isaac Iaggard, and Ed[ward] Blount, published 1623, OCLC 606515358, [Act IV, scene viii], page 90, column 2:
      By this Day and this Light, the fellow ha's mettell enough in his belly.
    • 2001, Harry J. Alexandrowicz, Testing your Mettle: Tough Problems and Real-world Solutions for Middle and High School Teachers, page xiii
      Please read on and discover the issues in education that test the mettle of those who experience this world every day.
    • 2021 April 28, Tara Siegel Bernard, “Trading Stock Tips on TikTok, Newbies Are Deeply Invested in Learning”, in The New York Times[1], ISSN 0362-4331:
      Its possible that some traders will become less interested as their offline lives resume more fully, but their mettle may really be tested when the market runs into its next downturn.
  2. Good temperament and character.
  3. (obsolete) Metal; a metallic substance.
    • 1624, Democritus Junior [pseudonym; Robert Burton], The Anatomy of Melancholy: [], 2nd edition, Oxford, Oxfordshire: Printed by John Lichfield and James Short, for Henry Cripps, OCLC 54573970:
      They have neither gold nor silver of their owne, wine nor oyle, or scarce any corne growing in those united Provinces, little or no Wood, Tinne, Lead, Iron, Silke, Wooll, any stuffe almost, or Mettle; and yet Hungary, Transilvania, that bragge of their mines, fertile England cannot compare with them.

Derived terms[edit]


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  1. (Scotland) This term needs a definition. Please help out and add a definition, then remove the text {{rfdef}}.
    • 1902, John Buchan, The Outgoing of the Tide
      And then one afternoon in the hinder end of April came young Heriotside riding to the Skerburnfoot. His arm was healed, he had got him a fine new suit of green, and his horse was a mettle beast that well set off his figure.


  1. ^ Douglas Harper (2001–2022), “mettle”, in Online Etymology Dictionary.