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persistent
adjective
- Firm or obstinate, as in making a demand or maintaining a stand: importunate, importune, insistent, urgent. See
continue
- Existing or occurring without interruption or end: around-the-clock, ceaseless, constant, continual, continuous, endless, eternal, everlasting, incessant, interminable, nonstop, ongoing, perpetual, relentless, round-the-clock, timeless, unceasing, unending, unfailing, uninterrupted, unremitting. See
continue
- Existing or remaining in the same state for an indefinitely long time: abiding, continuing, durable, enduring, lasting, long-lasting, long-lived, long-standing, old, perdurable, perennial, permanent. See
continue
- Of long duration: chronic, continuing, lingering, prolonged, protracted. See
continue
- Difficult to alleviate or cure: obstinate, pertinacious, stubborn. See
continue
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