Longman Dictionary of Contemporary English homepage

irresponsible

 adjective
     
ir‧re‧spon‧si‧ble
doing careless things without thinking or worrying about the possible bad results [≠ responsible]
totally/highly/completely etc irresponsible
When it comes to money, Dan is completely irresponsible.
it is irresponsible (for somebody) to do something
It would be irresponsible not to turn up for work without calling.
It was highly irresponsible of him to leave the children on their own in the pool.
—irresponsibly adverb:
He was acting totally irresponsibly.
—irresponsibility noun [uncountable]
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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