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Longman Dictionary of Contemporary English
irresponsible
adjective
COLLOCATIONS FROM CORPUS
■ ADVERB
highly
▪ I had no money and she was being highly irresponsible.
▪ This sect was and still is considered bizarre and highly irresponsible.
totally
▪ He's fun, but totally irresponsible.
▪ This action of Reg's was totally irresponsible on two counts.
EXAMPLES FROM OTHER ENTRIES
▪ Critics accused the governor of being irresponsible, and claimed that his new proposal would put thousands of US troops at risk.
▪ Police blame higher crime rates on irresponsible parents who allow their teenage children to stay out all night.
▪ When it comes to money, Dan is completely irresponsible.
EXAMPLES FROM CORPUS
▪ By shifting blame to their consumers, these industries have deftly evaded financial accountability for unsafe products and irresponsible marketing.
▪ Careless, stupid and now irresponsible.
▪ He is irresponsible about his debts, alcoholic, accident-prone, and susceptible to disease.
▪ Richard always used to be seen as irresponsible in the first half and elegiac in the second.
▪ The implication was clear: to discuss Article 6 would be an irresponsible aberration.
▪ There is so much poverty, corruption, irresponsible decision-making around.
The Collaborative International Dictionary
Irresponsible

Irresponsible \Ir`re*spon"si*ble\, a. [Pref. ir- not + responsible: cf. F. irresponsable.]

  1. Not responsible; not liable or able to answer for consequences; innocent.

  2. Not to be trusted; unreliable; lacking a proper sense of responsibility.

Douglas Harper's Etymology Dictionary
irresponsible

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.

Wiktionary
irresponsible

a. 1 Lacking a sense of responsibility; incapable of or not chargeable with responsibility; unable to respond to obligation; negligent. 2 Not responsible; not subject to responsibility; not to be held accountable, or called into question. n. Someone who is not responsible.

WordNet
irresponsible

adj. showing lack of care for consequences; "behaved like an irresponsible idiot"; "hasty and irresponsible action" [ant: responsible]

Usage examples of "irresponsible".

Occidental peoples, but peoples called progressive, are subject to the most frequent and violent changes of fashions, not in generations only, but in decades and years of a generation, as if the mass had no mind or taste of its own, but submitted to the irresponsible ukase of tailors and modistes, who are in alliance with enterprising manufacturers of novelties.

Concession was always a demand, never an offer, at this stage: another rule to prevent irresponsible players from tying up the grids when they had no intention of playing a Game.

I consider the proposal to send the Standing Naval Force to disrupt these perfectly legitimate Soviet naval exercises is unjustified, dangerous in the extreme, and, in the sense that such provocation and resultant confrontation could well lead to the outbreak of full-scale war, highly irresponsible.

This principle - absolute responsibility unconditionally combined with absolute authority - will gradually breed an elite of leaders such as today, in this era of irresponsible parliamentarianism, is utterly inconceivable.

It would be irresponsible of us to jeopardize your life, taking you down to a planet at war, when Phylar, Edward, and I are fully qualified Explorers.

His disclosure of a fact which, if made public, would inflict great injury on Miss Fraser and her programme, the network, and Starlite, was irresponsible and inexcusable, and certainly actionable.

Darkover half-awake, an untrained telepath, because that would be irresponsible.

They consisted of irregular troops, three hundred and forty of the Protectorate Regiment, one hundred and seventy Police, and two hundred volunteers, made up of that singular mixture of adventurers, younger sons, broken gentlemen, and irresponsible sportsmen who have always been the voortrekkers of the British Empire.

We got pissed off with the restrictions that were imposed on us as a result of this blokes irresponsible behavior and even more pissed off with him.

In fact, one matter on which almost all of the contending cerealogists agreed is that the later crop figures were much too complex and elegant to be due to mere human intervention, much less to some ragged and irresponsible hoaxers.

In the past, most of these universal concerns have had to be left to the competitive enterprise of profit-seeking individuals because there were as yet no collectivities organized to the pitch of ability needed to develop and control these concerns, but surely nobody in his senses believes that the supply and distribution of staple commodities about the earth by irresponsible persons and companies working entirely for monetary gain is the best possible method from the point of view of the race as a whole.

The public image of the Commissioners seemed to be one of irresponsible luxury, but Chen took his duties very seriously.

Medicine had borne most of the blame, in the popular Gen mind, for the mutation of the human race into Sime and Gen. The irresponsible use of drugs and certification of chemicals as safe for release to the environment had come about, people had believed, through the low moral standards of the men of medicine.

There she discovered that these computer- intruding hackers, who had been characterized as unethical, irresponsible, and a serious danger to society, did in fact have their own subculture and their own rules.

Cavanagh and his family after that irresponsible fool Rudzinski had caved in and given them all that soap-bubble nothing the Peacekeepers had collected.