chronic

I adjective ceaseless, confirmed, constant, continual, continuing, continuous, cyclical, deep-rooted, deep-seated, drawn out, endless, enduring, entrenched, established, ever-present, everlasting, extended, forever, frequent, habitual, immedicable, incessant, inextinguished, invariable, lasting, lingering, long-continuing, long-lived, long-standing, longstanding, maintained, never-ceasing, never-stopping, not averruncated, not restorable, of long duration, often, ongoing, perdurable, perennial, permanent, perpetual, persevering, persistent, persisting, prolonged, protracted, recurrent, recurring, regular, repeating, repetitious, repetitive, resisting, returning, returning at intervals, serious, set, settled, steadfast, stubborn, sustained, tenacious, unalleviated, unceasing, uncorrectable, undestroyed, undying, unending, unerasable, unfading, unhealable, unintermitting, uninterrupted, unmitigated, unmitigating, unrelievable, unremedied, unremittent, unremitting, unshifting, unslackening, unstopped, unstopping, unsubsiding, unsuppressed, unvarying, unyielding, virulent, wearing II index constant, durable, habitual, incorrigible, inveterate, permanent, perpetual, persistent, stable