1. showing a lack of proper attention, respect, or care; negligent or heedless
Usage: formal or literary; often followed by 'of'

Examples

• He was disregardful of the warning signs posted along the trail.
• The company's disregardful attitude toward safety regulations led to serious consequences.
• She made a disregardful comment that hurt her friend's feelings.
• The driver's disregardful behavior endangered everyone on the road.
• They were disregardful of the rules and faced penalties as a result.