The opposite of responsible
Can't be trusted to do what they should do.
said, done, or characterized by a lack of a sense of responsibility:
effects of financial irresponsibility?
testability
Want of, or freedom from, responsibility or accountability.
Irresponsibility
The correct spelling is irresponsibility (carelessness, undependability).
They want to have a baby, or simply irresponsibility.
The Government has responded by scolding your parents for irresponsibility.
Irresponsibility describes a lack of responsible action.
social irresponsibility fecklessness anti social
The term "lunacy" is old-fashioned for mental illness especially caused by the changing phases of the moon. The term is used in modern contexts for extreme stupidity or irresponsibility.
The correct spelling is "irresponsibility" (recklessness, state of being undependable).
The first irresponsibility is that the age 12 child has NO drivers license. Next is inexperience, lacking maturity to accept the possibility that he or she is driving a two ton instrument of death.