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irresponsible

[ir-i-spon-suh-buh l] /ˌɪr ɪˈspɒn sə bəl/
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
1640-1650
1640-50; ir-2 + responsible
Related forms
irresponsibility, irresponsibleness, noun
irresponsibly, adverb
Synonyms
1. unreliable, undependable, thoughtless.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for irresponsibleness

irresponsible

/ˌɪrɪˈspɒnsəbəl/
adjective
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
Derived Forms
irresponsibility, irresponsibleness, noun
irresponsibly, adverb
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin and History for irresponsibleness

irresponsible

adj.

1640s, "not legally answerable for conduct or actions," from assimilated form of in- (1) "not, opposite of" + responsible. Meaning "not acting with a sense of responsibility" is from 1680s. Related: Irresponsibly.

Online Etymology Dictionary, © 2010 Douglas Harper
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