Definition of "undreamed"

unpathed waters and undreamed shores

c. 1610–1611 (date written), William Shakespeare, “The Winters Tale”, in Mr. William Shakespeares Comedies, Histories, & Tragedies […] (First Folio), London: […] Isaac Iaggard, and Ed[ward] Blount, published 1623, [Act IV, scene iii]

The Germans have understood this, and have taken such very energetic measures that their primary schools are safe places for all to a degree undreamed of by us.

1907, Margaret McMillan, Labour and Childhood, page 5