1. showing smug or uncritical satisfaction with oneself or one’s achievements

Examples

• The team became complacent after winning several games in a row.
• Don’t get complacent about your grades just because you did well last semester.
• The company’s complacent attitude toward customer service cost them many clients.
• She warned against becoming complacent in the face of early success.
• His complacent smile suggested he thought the job was already his.
• The coach criticized the players for their complacent performance.