<p><strong>Noun</strong></p><ul><li>A disposition or tendency to look on the more favorable side of events or conditions and to expect the most favorable outcome.</li><li>Synonyms: cheerfulness, hopefulness, confidence.</li><li>Antonyms: cynicism, pessimism.</li><li>The belief that good ultimately predominates over evil in the world.</li><li>Antonyms: cynicism, pessimism.</li><li>The belief that goodness pervades reality.</li><li>The doctrine that the existing world is the best of all possible worlds.</li></ul>