Irresponsibility usually suggests someone's failure to meet obligations or care for the well-being of others. His irresponsibility in handling the team's project led to missed deadlines.
Pro Tip 2/3
Professional Context
Used to describe neglect in work or official roles, often suggesting laziness or disregard for rules. The manager's irresponsibility compromised the company's safety standards.
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Behavioral Attribute
Describes a habitual pattern, not just a single instance; seen as part of one's character. Her irresponsibility in spending money left her with significant debt.