cocksure (adj.)

• arrogant
• assured
• certain
• confident
• convinced
• decided
• determined
• overconfident
• overweening
• persuaded
• poised
• pompous
• positive
• proud
• reassured
• secure
• self-assured
• self-confident
• self-important
• self-reliant
• sure
• unafraid
• unfaltering
• unhesitating
• unwavering