We've found 3 phrases for irresponsible (0.116 seconds):

bad egg »    Someone whose behaviour is reprehensible or irresponsible; a rogue.

play around »    To behave in a silly, or childish, or irresponsible way.

sow one's wild oats »    To indulge in a period of irresponsible behavior, particularly sexually; Often used in reference to young adults or to the recently divorced.

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