invet'rate

Adjective

inveterate (comparative more inveterate, superlative most inveterate)

1. Firmly established from having been around for a long time; of long standing.
   • Near-synonyms: deep-rooted, ingrained, ineradicable, indelible, radicated, chronic, permanent

   Synonyms:

   long-standing, deep-rooted, ingrained, ineradicable, indelible, radicated, chronic, permanent

   Antonyms:

   transient, temporary, momentary, fleeting, impermanent, shifting, acute, novel

2. Having had a habit (usually a bad habit) for a long time.
   • Near-synonyms: hardened, chronic, dyed-in-the-wool

   Synonyms:

   hardened, chronic, dyed-in-the-wool

   Antonyms:

   casual, sometime, occasional, dilettante

3. Malignant; virulent; spiteful.
   • A man of mild manners can form no idea of inveterate revenge or cruelty[…]1748, David Hume, Enquiries concerning the human understanding and concerning the principles of morals, London: Oxford University Press, published 1973, § 15

See all 4 meanings of inveterate