Definition of "unguessed"

And what her thoughts are nobody knows, She sits with her secret hid, unguessed, With her strange eyes bent on the distant west, So the slow years come, and the slow year goes, O'er the Lady Cecile.

1887, Marietta Holley, Poems‎

She spoke in wonder, for Patricia had glimpsed an unguessed Rudolph Musgrave.

1915, James Branch Cabell, The Rivet in Grandfather's Neck‎