1. not showing a proper sense of responsibility; careless about the consequences of one's actions

Examples

• It was irresponsible of him to leave the children alone.
• The company's irresponsible dumping of chemicals polluted the river.
• She made an irresponsible decision to quit her job without having another one lined up.
• The irresponsible driver was texting while speeding through the school zone.
• His irresponsible spending habits left him deeply in debt.
• The newspaper was criticized for its irresponsible reporting of unverified rumors.