irresponsible

[ir-i-spon-suh-buhl]
adjective
1.
said, done, or characterized by a lack of a sense of responsibility: His refusal to work shows him to be completely irresponsible.
2.
not capable of or qualified for responsibility, as due to age, circumstances, or a mental deficiency.
3.
not responsible, answerable, or accountable to higher authority: irresponsible as a monarch.
noun
4.
an irresponsible person.

Origin:
1640–50; ir-2 + responsible

irresponsibility, irresponsibleness, noun
irresponsibly, adverb


1. unreliable, undependable, thoughtless.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
irresponsible (ˌɪrɪˈspɒnsəbəl)
 
adj
1.  not showing or done with due care for the consequences of one's actions or attitudes; reckless
2.  not capable of bearing responsibility
3.  archaic not answerable to a higher authority for one's actions
 
irresponsi'bility
 
n
 
irre'sponsibleness
 
n
 
irre'sponsibly
 
adv

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Etymonline
Word Origin & History

irresponsible
1648, "not legally answerable for conduct or actions," from in- "not" + responsible (q.v.). Meaning "not acting with a sense of responsibility" is from 1681.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Depew believed that anonymous posts encouraged irresponsibility.
For me, the primary message is about the irresponsibility of both government
  and scientists.
The attribution of the problem to laziness and irresponsibility has only
  marginal merit, but lacks realism.
Also, the warming aspect is the result while irresponsibility is the cause.
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