1. the quality of being certain or confident about something
2. the quality of being reliable or steady

Examples

• She spoke with complete sureness about her decision.
• The sureness of his grip helped him climb the rock wall safely.
• I admired the sureness in her voice during the presentation.
• The dancer moved with remarkable sureness across the stage.
• His sureness about the answer impressed the teacher.
• The pilot’s sureness in handling the controls calmed the passengers.
• There was no sureness in his voice when he made the promise.