persistent

adj.

1. Refusing to give up or let go; persevering obstinately.
2. Insistently repetitive or continuous: a persistent ringing of the telephone.
3. Existing or remaining in the same state for an indefinitely long time; enduring: persistent rumors; a persistent infection.
4. Botany. Lasting past maturity without falling off, as the calyx on an eggplant or the scales of a pine cone.
5. Zoology. Retained permanently, rather than disappearing in an early stage of development: the persistent gills of fishes.

persistently per·sis'tent·ly adv.

Describing a pesticide or other pollutant that is not readily broken down and can persist for long periods, causing damage in the environment. For example, the herbicides Paraquat and DDT can persist in the soil for many years after their application.

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Permanent. See persistent data, persistent name and persistent object.

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adjective

1. Firm or obstinate, as in making a demand or maintaining a stand: importunate, importune, insistent, urgent. See continue/stop/pause.
2. 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/stop/pause.
3. 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/stop/pause.
4. Of long duration: chronic, continuing, lingering, prolonged, protracted. See continue/stop/pause.
5. Difficult to alleviate or cure: obstinate, pertinacious, stubborn. See continue/stop/pause.

adj

Definition: determined; continuous
Antonyms: irresolute, lazy, relenting, surrendering, yielding

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Relative to embryological defects refers to persistence of an entity into external life in such a way as to cause some reduction of efficiency. The common defects are listed under the names of the compromised organs. See also persistent right aortic arch, ductus arteriosus, penile preputial frenulum, imperforate hymen, persistent urachus, persistent hyperplastic vitreous, persistent pupillary membrane.

• p. corpus luteum — see corpus luteum.
• p. ductus arteriosus — see patent ductus arteriosus.
• p. ductus venosus — see ductus venosus.
• p. omphalomesenteric duct — see omphalomesenteric duct.
• p. posterior perilenticular vascular tunic — the tunic is generated in the embryo but atrophies just before birth. Persistence of some part of the tunic into adult life is common but of no clinical significance.
• p. recumbency — the animal is normal in other respects but does not rise to its hooves for a period exceeding 24 hours.
• p. right aorta arch — see persistent right aortic arch.
• p. truncus arteriosus — may cause neonatal congestive heart failure and cyanosis; the interventricular septum is usually patent. See also truncus arteriosus.

1. Lasting past maturity without falling off, as the calyx on an eggplant or the scales of a pinecone.
2. A term used to describe a pesticide that remains effective (sometimes dangerously so) for a long time after it is applied.

IN BRIEF: Refusing to give up; steady and determined.

One very important ingredient of success is a good, wide-awake, persistent, tireless enemy. — Frank B. Shutts

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Common misspelling(s) of persistent

• persistant

Dansk (Danish)
adj. - hårdnakket, ihærdig, vedvarende

Nederlands (Dutch)
hardnekkig, aanhoudend, volhardend, (van bladeren etc.) blijvend

Français (French)
adj. - persévérant, obstiné, continuel, tenace

Deutsch (German)
adj. - dauernd, beharrlich, hartnäckig

Ελληνική (Greek)
adj. - επίμονος, διαρκής, εξακολουθητικός, έμμονος

Italiano (Italian)
persistente, ostinato, fermo, instancabile

Português (Portuguese)
adj. - persistente

Русский (Russian)
постоянный, упорный, настойчивый, неутомимый

Español (Spanish)
adj. - continuo, persistente, obstinado, porfiado, tenaz, perseverante

Svenska (Swedish)
adj. - envis, ihärdig, orubblig, ståndaktig

中文（简体）(Chinese (Simplified))
固执的, 持续的, 坚持的

中文（繁體）(Chinese (Traditional))
adj. - 固執的, 持續的, 堅持的

한국어 (Korean)
adj. - 고집하는, 완고한, 영속성의

日本語 (Japanese)
adj. - 粘り強い, しつこい, いつまでも続く, 持続性の

العربيه (Arabic)
‏(صفه) مقاومه, إصرار, تصميم‏

עברית (Hebrew)
adj. - ‮עקשן, מתמיד, נמשך, ממשיך‬

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