primeval

/prī-ˈmē-vəl/

primeve, in same sense, or its source, Late Latin prīmaevus "earliest, original, principal" (going back to Latin, "young, youthful," from prīmus "first, foremost, earliest" + -aevus, adjective derivative of aevum "age, lifetime") +

adjective

  1. of or relating to the earliest ages (as of the world or human history) : ancient, primitive

  2. primordial

100 acres of primeval forest which has never felt an ax