<p><strong>Adjective</strong></p><ul><li>perfectly sure or certain</li><li>completely confident in one's own mind</li><li>perfectly secure or safe</li></ul><p><strong>Synonyms</strong></p><ul><li>conceited</li><li>arrogant</li><li>cocky</li></ul><p><strong>Examples</strong></p><ul><li>She was cocksure that she was able to do the job better than anyone else.</li><li>He was so cocksure he would win the election that he didn't even bother to campaign.</li></ul>