inveterate
C1CEFR level
62/100Rarity: rare
FormalRegister
Having a long-established and unlikely-to-change habit or interest.
An inveterate gambler, he could not resist the racecourse.
Rarity runs from 0 (a word everyone knows) to 100 (almost never seen outside specialist or literary writing). Level is the word's real difficulty on the CEFR scale, from A1 to C2.
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