Webster's English Dictionary

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irresponsible

ir.re.spon.si.ble \-'spa:n(t)-s*-b*l\ \-ble-\ aj : not responsible : as  : 
   not answerable to higher authority  : said or done with no sense of 
   responsibility  : lacking a sense of responsibility  : unable esp. mentally 
   or financially to bear responsibility  - ir.re.spon.si.ble.ness n