noun
US/ˌɪr.ɪˌspɑːn.səˈbɪl.ə.ti/
UK/ˌɪr.ɪˌspɒn.sɪˈbɪl.ɪ.ti/
Behavior in which you do not think about the results of your actions or care for others.
In context
The manager criticized the irresponsibility of employees who left the machines running overnight.
Short entry. Full notes coming.