<p><strong>Adjective</strong></p><ul><li>free of deceit, hypocrisy, or falseness; earnest: a sincere apology.</li><li>genuine; real: a sincere effort to improve; a sincere friend.</li><li>pure; unmixed; unadulterated.</li><li>sound; unimpaired.</li></ul><p><strong>Synonyms</strong></p><ul><li>unaffected, guileless, open, honest, candid, frank</li></ul><p><strong>Antonyms</strong></p><ul><li>false</li></ul>