Antonym: responsible. Similar words: responsible, responsible for, be responsible for, responsibility, responsive, response, correspond, correspondent. Meaning: [‚ɪrɪ'spɑnsəbl /-'spɒn-] 
adj. showing lack of care for consequences.
adj. showing lack of care for consequences. 
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1 Thick patchy fog and irresponsible driving were to blame.
2 The mischief arose from irresponsible gossip.
3 This was highly irresponsible behaviour.
4 When it comes to money, Dan is completely irresponsible.
5 I felt that it was irresponsible to advocate the legalisation of drugs.
6 There's too much mud-slinging by irresponsible journalists.
7 He regarded the young man as feckless and irresponsible.
8 They all think of him as being irresponsible.
9 The paper baste the candidate for irresponsible statement.
10 I was made to feel guilty and irresponsible.
11 He's fun, but totally irresponsible.
12 It would be irresponsible to ignore the situation.
13 Her casual dismissal of the threats seemed irresponsible.
14 Her irresponsible behaviour cost her father many sleepless nights.
15 To pretend ignorance of the situation would be irresponsible.
16 Green-field was behaving like an irresponsible idiot.
17 It would be irresponsible to turn such a man loose on society.
18 His behaviour was very irresponsible; he might have hurt somebody.
19 It is irresponsible to let small children go out alone when it's dark.
20 It was highly irresponsible of him to leave the children on their own in the pool.
21 It is irresponsible of you not to prepare students for their exams.
22 It would be irresponsible not to turn up for work without calling.
23 It is socially irresponsible to refuse young people advice on sexual matters.
24 Cheryl wrote the book on being irresponsible.
25 "That was unbelievably irresponsible,(www.Sentencedict.com)" huffed one teacher.
26 However, the rule is irresponsible if applied generally.
27 Careless, stupid and now irresponsible.
28 I remember him as a charming but irresponsible spendthrift.
29 There is so much poverty, corruption, irresponsible decision-making around.
30 We don't want to squander that through lax cost control, irresponsible pay increases and things like that.
More similar words: responsible, responsible for, be responsible for, responsibility, responsive, response, correspond, correspondent, correspondingly, corresponding to, irresistible, respond, respondent, sensible, irrespective, irrespective of, insensible, ostensible, comprehensible, reprehensible, incomprehensible, expressible, as soon as possible, incompressible, inexpressible, despondent, sponsor, insensibly, ostensibly, visible.