Meaning of “irresponsible” in the English Dictionary

"irresponsible" in British English

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irresponsibleadjective

uk /ˌɪr.ɪˈspɒn.sə.bəl/ us /ˌɪr.əˈspɑːn.sə.bəl/ disapproving
irresponsibly
adverb uk /ˌɪr.ɪˈspɒn.sə.bli/ us /ˌɪr.əˈspɑːn.sə.bli/

It's unlike you to behave so irresponsibly.
irresponsibility
noun [ U ] uk /ˌɪr.ɪˌspɒn.səˈbɪl.ə.ti/ us /ˌɪr.əˌspɑːn.səˈbɪl.ə.t̬i/

It was an act of gross irresponsibility to leave someone who wasn't properly trained in charge of the machine.

(Definition of “irresponsible” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"irresponsible" in American English

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irresponsibleadjective

us /ˌɪr·ɪˈspɑn·sə·bəl/

not thinking carefully enough or not caring about what might result from actions taken:

[ + to infinitive ] It would have been irresponsible to let Claire drive home when she was so tired.
irresponsibly
adverb us /ˌɪr·ɪˈspɑn·sə·bli/

(Definition of “irresponsible” from the Cambridge Academic Content Dictionary © Cambridge University Press)