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irresponsible

adjective
 
 
/ˌɪr.ɪˈspɒn.sɪ.bl̩/ US  /-ˈspɑːn-/ disapproving

Definition

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
 
 
/-bli/ adverb
It's unlike you to behave so irresponsibly.InconsiderateSelfishness
irresponsibility
 
 
/ˌɪr.ɪˌspɒn.səˈbɪl.ɪ.ti/ US  /-ˌspɑːn.səˈbɪl.ə.t̬i/ noun [U]
It was an act of gross irresponsibility to leave someone who wasn't properly trained in charge of the machine.InconsiderateSelfishness
(Definition of irresponsible adjective from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

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