IPA: /ˈtrɒɡləˌdaɪt/
KK: /ˈtrɒɡləˌdaɪt/
A person who lives in a cave or is considered to be very old-fashioned or unsophisticated.
He was seen as a troglodyte for his outdated views on technology.
Troglodyte is formed from "troglodytes" (from Greek "troglodytēs", meaning one who dwells in a cave, from "trogle" meaning hole or cave and "dyein" meaning to enter). The word refers to a person who lives in a cave or a person considered to be primitive or uncivilized.
Imagine someone who 'enters a cave' ('dyein') to live in a 'hole' ('trogle') — that's why a troglodyte is someone who lives in a cave.
No commonly confused words.