troglodyte
A member of a supposed prehistoric race that lived in caves or holes, a caveman.
Anything that lives underground.
The cave was populated by albino scorpions, blind salamanders, and other troglodytes.
The Eurasian wren, Troglodytes troglodytes.
A person who chooses not to keep up to date with the latest software and hardware.
Where it comes from
Learned borrowing from Latin Trōglodytae (“cave-dwelling people”), from Ancient Greek τρωγλοδύτης (trōglodútēs, “one who dwells in holes”), from τρώγλη (trṓglē, “hole”) + δύω (dúō, “to get into”).
Adapted from the Wiktionary entry troglodyte (CC BY-SA 4.0).