Definition of irresponsible adjective from the Oxford Advanced American Dictionary

 

irresponsible

 adjective
adjective
NAmE//ˌɪrɪˈspɑnsəbl//
 
(disapproving)
 
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(of a person) not thinking enough about the effects of what they do; not showing a feeling of responsibility an irresponsible teenager an irresponsible attitude It would be irresponsible to ignore the situation. opposite responsible
irresponsibility
 
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NAmE//ˌɪrɪˌspɑnsəˈbɪlət̮i//
 
noun [uncountable]
irresponsibly
 
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NAmE//ˌɪrɪˈspɑnsəbli//
 
adverb
See the Oxford Advanced Learner's Dictionary entry: irresponsible