ir·re·spon·si·ble

[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

ir·re·spon·si·bil·i·ty, ir·re·spon·si·ble·ness, noun
ir·re·spon·si·bly, adverb


1. unreliable, undependable, thoughtless.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2013.
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World English Dictionary
irresponsible (ˌɪrɪˈspɒnsəbəl) [Click for IPA pronunciation guide]
 
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
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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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
Although you do run the risk that it will be made fun of on snarky
  irresponsible blogs.
It is irresponsible to let the crazy tail wag the dog.
It would be truly irresponsible to move forward without such valuable data.
But it would have been irresponsible to have tried to do all of it.
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