IPA: /ɪnˈvɛtərət/
KK: /ɪnˈvɛtərɪt/
Describing someone or something that has a long-standing habit or tendency that is unlikely to change.
He is an inveterate gambler who cannot resist placing bets.
Inveterate is formed from "in-" (meaning not) and "veterare" (from Latin "vetus", meaning old). The word describes something that is not just old but deeply ingrained or established over time, often referring to habits or practices that are long-standing and difficult to change.
Think of something that is 'not' ('in-') just old ('vetus') but has become deeply established over time, like a habit that is hard to break.