Complacency (noun)

1. A feeling of self-satisfaction, especially when accompanied by an unawareness of danger or trouble.
2. A feeling of smug or uncritical satisfaction with oneself or one's achievements.

Origin:

The word complacency is derived from the latin word "complacens" meaning "pleasing" and "complacere" meaning "to please." it was first used in the early 17th century.

Examples:

1. The team's complacency led to their defeat in the championship game.
2. He was criticized for his complacency towards the problem.
3. Her complacency about her job performance was concerning to her supervisor.
4. The company's complacency about its market position proved to be its downfall.
5. His complacency about his health ultimately led to severe health issues.