Meaning of “irresponsible” - Learner’s Dictionary

irresponsible

adjective uk us /ˌɪrɪˈspɒnsəbl/

B2 not thinking about the possible bad results of what you are doing:

an irresponsible attitude
irresponsibility uk us /ˌɪrɪˌspɒnsəˈbɪləti/ noun [ U ]
irresponsibly adverb

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