unfenced

avoin Not enclosed by a fence or other boundary; free to roam over a wider area.
puhekieltä Without protection; defenseless.
1662, w:Henry More|Henry More, s:An Antidote Against Atheism|An Antidote Against Atheism, Book II, A Collection of Several Philosophical Writings of Dr. Henry More, p. 81:

"She Nature has made the hinder part of the Head, more strong, as being otherwise unfenced against falls and other casualties."