different between untaught vs impetuous

English

un- +? taught

untaught (comparative more untaught, superlative most untaught)

Not taught; uneducated.
- c. 1515–1516, published 1568, John Skelton, Again?t venemous tongues enpoy?oned with ?claunder and fal?e detractions &c.:
  My ?coles are not for unthriftes untaught,
  For frantick faitours half mad and half ?traught;
  But my learning is of another degree
  To taunt theim like liddrons, lewde as thei bee.
- 2005, Christine Alexander, Juliet McMaster, The Child Writer from Austen to Woolf (page 58)
  The gazing, the spying, and the ability to divine the eternal in the vivid manifestations of nature, here attributed to the young child, seem to be realised in this relatively untaught child of the woods of Oregon.
(not comparable) Not taught; not conveyed by means of instruction.
- 1937, Manly Wade Wellman, School for the Unspeakable
  What they used to teach here
  Now goes untaught.

From Middle English impetuous, from Old French impetueux, from Late Latin impetu?sus (“violent”), from Latin impetus (“attack, violence”).

impetuous (comparative more impetuous, superlative most impetuous)

Making arbitrary decisions, especially in an impulsive and forceful manner.
- 1880, John Weeks Moore, Complete Encyclopaedia of Music, "Beethoven, Louis Van":
  But it was natural, that the impetuous, restless young artist should incline more to excess of strength than of delicacy in his playing.
Characterized by sudden violence or vehemence.
- 1794, Ann Radcliffe, The Mysteries of Udolpho, vol. II, chapter I:
  He stands, and views in the faint rays
  Far, far below, the torrent's rising surge,
  And listens to the wild impetuous roar
- 1917 rev. 1925, Ezra Pound, "Canto I"
  Unsheathed the narrow sword,
  I sat to keep off the impetuous impotent dead ...

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