irresponsible (adjective)

1. The protagonist's irresponsibility in leaving the front door unlocked led to a horrifying encounter with a masked intruder.

2. Nero's irresponsibility and reckless rule were contributing factors to the decline and fall of the Roman Empire.

3. The movie portrayed the consequences of irresponsibility through a character who ignored warnings and wandered into a haunted house, facing terrifying consequences.

4. The novel explores the theme of irresponsibility through the actions of the main character, who makes reckless decisions without considering the potential outcomes.