untaught

oppimaton Not taught; uneducated.
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.

What they used to teach hereNow goes untaught.