Definition of "unharboured"
(obsolete) Offering no harbour or shelter.
Quotations
And like a quiver'd nymph with arrowes keeneMay trace huge forreſts, and unharbour'd heaths
1634 October 9 (first performance), [John Milton], edited by H[enry] Lawes, A Maske Presented at Ludlow Castle, 1634: […], London: […] [Augustine Matthews] for Hvmphrey Robinson, […], published 1637; reprinted as Comus: […] (Dodd, Mead & Company’s Facsimile Reprints of Rare Books; Literature Series; no. I), New York, N.Y.: Dodd, Mead & Company, 1903, page 15