troglodyte

Meanings

1. A member of a supposed prehistoric race that lived in caves or holes, a caveman.
2. Anything that lives underground.
3. The Eurasian wren, Troglodytes troglodytes.
4. A reclusive, reactionary or out-of-date person, especially if brutish.
5. A person who chooses not to keep up to date with the latest software and hardware.

Etymology

Learned borrowing from Latin trōglodyta (“cave-dwelling person”), from Ancient Greek τρωγλοδύτης (trōglodútēs, “one who dwells in holes”), from τρώγλη (trṓglē, “hole”) + δύω (dúō, “to get into”).