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Adjective: inveterate  in've-tu-rut
  1. Habitual
    "He was an inveterate liar, unable to tell the truth";
    - chronic
Adverb: inveterate  in've-tu-rut
  1. In a habitual and longstanding manner
    "He was an inveterate smoker for over 40 years";
    - chronically

See also: usual