• Webster's Revised Unabridged Dictionary
    • a Harborless Without a harbor; shelterless.
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Century Dictionary and Cyclopedia
    • harborless Destitute of shelter or lodging; shelterless.
    • harborless Having no harbor or haven.
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In literature:

On the north was an almost harborless sea.
"The International Magazine, Volume 2, No. 3, February, 1851" by Various
It blew hard against the shore, which was as dreary and harborless as you can conceive.
"Canoeing in the wilderness" by Henry David Thoreau