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persistent

[per-sis-tuh nt, -zis-] /pərˈsɪs tənt, -ˈzɪs-/
adjective
1.
persisting, especially in spite of opposition, obstacles, discouragement, etc.; persevering:
a most annoyingly persistent young man.
2.
lasting or enduring tenaciously:
the persistent aroma of verbena; a persistent cough.
3.
constantly repeated; continued:
persistent noise.
4.
Biology.
  1. continuing or permanent.
  2. having continuity of phylogenetic characteristics.
5.
Botany. remaining attached beyond the usual time, as flowers, flower parts, or leaves.
Origin
1820-1830
1820-30; < Latin persistent- (stem of persistēns), present participle of persistere to persist; see -ent
Related forms
persistently, adverb
nonpersistent, adjective
nonpersistently, adverb
Synonyms
1. indefatigable, pertinacious, tenacious. See stubborn. 3. steady.
Antonyms
3. sporadic.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Examples from the web for nonpersistent
  • Generally speaking, nonpersistent agents present only an inhalation hazard.
British Dictionary definitions for nonpersistent

nonpersistent

/ˌnɒnpəˈsɪstənt/
adjective
1.
(of pesticides) breaking down rapidly after application; not persisting in the environment

persistent

/pəˈsɪstənt/
adjective
1.
showing persistence
2.
incessantly repeated; unrelenting: your persistent questioning
3.
(of plant parts) remaining attached to the plant after the normal time of withering: a fruit surrounded by a persistent perianth
4.
(zoology)
  1. (of parts normally present only in young stages) present in the adult: persistent gills in axolotls
  2. continuing to grow or develop after the normal period of growth: persistent teeth
5.
(of a chemical, esp when used as an insecticide) slow to break down; not easily degradable
Derived Forms
persistently, adverb
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for nonpersistent

persistent

adj.

1723, from persistence or from Latin persistentem (nominative persistens), present participle of persistere (see persist). Related: Persistently.

Online Etymology Dictionary, © 2010 Douglas Harper
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nonpersistent in Medicine

nonpersistent non·per·sis·tent (nŏn'pər-sĭs'tənt)
adj.
Having a short life or existence under natural conditions.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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