Etymology
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inveterate (adj.)

late 14c., "old," from Latin inveteratus "of long standing, chronic, old," past participle of inveterare "become old in," from in- "in, into" (from PIE root *en "in") + verb from vetus (genitive veteris) "old" (see veteran). From early 15c. as "firmly established by long continuance;" from c. 1500, of persons, "hardened, confirmed" (in habit, etc.). Related: Inveterateness.

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Definitions of inveterate
1
inveterate (adv.)
in a habitual and longstanding manner;
Synonyms: chronically
2
inveterate (adj.)
habitual;
Synonyms: chronic
From wordnet.princeton.edu