1. (adjective) persuaded of; very sure

• convinced
• positive

2. (adjective) not liable to error in judgment or action

• sure-footed
• surefooted

1. (adjective) having or marked by confidence or assurance

• assured
• cocksure
• overconfident
• positive
• reassured
• self-assured
• self-confident

2. (adjective) persuaded of; very sure

• certain
• sure

3. (adjective) not liable to error in judgment or action

• capable

1. (adjective) having or marked by confidence or assurance

• assurance
• authority
• confidence
• self-assurance
• self-confidence
• sureness
• confidence

1. (adjective) having or marked by confidence or assurance

• diffident
• shy
• timid
• unsure