der·e·lic·tion

[der-uh-lik-shuhn]
noun
1.
deliberate or conscious neglect; negligence; delinquency: dereliction of duty.
2.
the act of abandoning something.
3.
the state of being abandoned.
4.
Law. a leaving dry of land by recession of the water line.

Origin:
1590–1600; < Latin dērelictiōn- (stem of dērelictiō) an abandoning, equivalent to dērelict(us) (see derelict) + -iōn- -ion


1. See neglect. 2. desertion.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2013.
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Dereliction is a GRE word you need to know.
So is insouciant. Does it mean:
tending or serving to admonish
free from concern, worry, or anxiety; carefree; nonchalant.
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World English Dictionary
dereliction (ˌdɛrɪˈlɪkʃən) [Click for IPA pronunciation guide]
 
n
1.  deliberate, conscious, or wilful neglect (esp in the phrase dereliction of duty)
2.  the act of abandoning or deserting or the state of being abandoned or deserted
3.  law
 a.  accretion of dry land gained by the gradual receding of the sea or by a river changing its course
 b.  the land thus left

Collins English Dictionary - Complete & Unabridged 10th Edition
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Etymonline
Word Origin & History

dereliction
1590s, "abandonment" (formerly with a wider range than in modern use, e.g. of the sea withdrawing from the land), from L. derelictionem, noun of action from derelinquere (see derelict). Meaning "failure in duty" is from c.1830.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Dereliction of duty was a primary cause of soldiers getting into trouble.
Down amid the eerie dereliction, both the allure and the scepticism are
  understandable.
The eight soldiers were charged with manslaughter, negligent homicide, reckless
  endangerment and dereliction of duty.
Schwartz is charged with eight counts of dereliction of duty.
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