Definition of "untaught"

My ſcoles are not for unthriftes untaught,For frantick faitours half mad and half ſtraught;But my learning is of another degreeTo taunt theim like liddrons, lewde as thei bee.

c. 1515–1516, published 1568, John Skelton, Againſt venemous tongues enpoyſoned with ſclaunder and falſe detractions &c.

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.

2005, Christine Alexander, Juliet McMaster, The Child Writer from Austen to Woolf, page 58

What they used to teach hereNow goes untaught.

1937, Manly Wade Wellman, School for the Unspeakable