Unploughed, untilled.

Of an area of land: not ploughed. Also with up. Also figurative or in figurative contexts.

(un-, prefix1 affix 2.)

Unploughed.

Of earth: that has never been ploughed. Obsolete.

That has not been conquered, tried, worked, etc. Of soil, metal, etc.: that has never been disturbed or worked. See also maiden-wax n. at compounds 2.