1. most excessively confident or arrogant; most conceited
Usage: superlative form of cocky

Examples

• He was the cockiest player on the team, always bragging about his skills.
• She became even cockier after winning the championship.
• The cockiest student in class was shocked when he failed the exam.
• His cockiest moment came right before he tripped on stage.
• The cockiest contestant was eliminated first from the competition.
• Even at his cockiest, he never insulted his opponents directly.