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English definition of “irresponsible”

irresponsible

adjective uk   /ˌɪr.ɪˈspɒn.sɪ.bl̩/ us    /-ˈspɑːn-/ disapproving
B2 not thinking enough or not worrying about the possible results of what you do: [+ to infinitive] It would be irresponsible to ignore these warnings.InconsiderateSelfishness
irresponsibly
adverb uk   /-bli/ us  
It's unlike you to behave so irresponsibly.InconsiderateSelfishness
irresponsibility
noun [U] uk   /ˌɪr.ɪˌspɒn.səˈbɪl.ɪ.ti/ us    /-ˌspɑːn.səˈbɪl.ə.t̬i/
It was an act of gross irresponsibility to leave someone who wasn't properly trained in charge of the machine.InconsiderateSelfishness
(Definition of irresponsible from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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