troglodyte

noun5

1. •
   A member of a supposed prehistoric race that lived in caves or holes, a caveman.
2. •
   Anything that lives underground.

   • The cave was populated by albino scorpions, blind salamanders, and other troglodytes.
3. •
   A person who chooses not to keep up to date with the latest software and hardware.
4. •
   (disapproving) A reclusive, reactionary or out-of-date person, especially if brutish.
5. •
   The Eurasian wren, Troglodytes troglodytes.