<p><strong>Adjective</strong></p><ul><li>well-advanced or competent in any art, science, or subject; skilled: a proficient swimmer.</li><li>Synonyms: accomplished, experienced, competent, adept, finished, able</li><li>Antonyms: inept, unskilled</li></ul><p><strong>Noun</strong></p><ul><li>an expert.</li></ul>