| a. | 1. | Relating to time; according to time. | |||
| 2. | Continuing for a long time; lingering; habitual.
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| Adj. | 1. | chronic - being long-lasting and recurrent or characterized by long suffering; "chronic indigestion"; "a chronic shortage of funds"; "a chronic invalid" Antonyms: acute - having or experiencing a rapid onset and short but severe course; "acute appendicitis"; "the acute phase of the illness"; "acute patients" |
| 2. | chronic - having a habit of long standing; "a chronic smoker" |
Lasting a long time. Chronic diseases develop slowly. Chronic renal failure may develop over many years and lead to end-stage renal disease.
abiding, accepted, accustomed, age-long, aged, ancient, antique, confirmed, customary, deep-dyed, deep-fixed, deep-rooted, deep-seated, deep-set, deep-settled, diuturnal, durable, dyed-in-the-wool, enduring, established, evergreen, fast, fixed, habitual, habituated, hardened, hardy, immutable, implanted, incorrigible, inculcated, infixed, ingrained, instilled, intransient, inveterate, irreversible, lasting, long-established, long-lasting, long-lived, long-standing, long-term, longeval, longevous, macrobiotic, of long duration, of long standing, perdurable, perduring, permanent, perpetual, persisting, remaining, rooted, routine, sempervirent, set, settled, settled in habit, stable, staying, steadfast, thorough, tough, unfading, vital, wonted