uncrowned
adjective uk/ˌʌnˈkraʊnd/ us/ˌʌnˈkraʊnd/
uncrowned king/queen 无冕之王（尤指没有官方职衔的某一领域的杰出人物）
a man or woman who is considered to be the best, the most famous, or the most powerful in a particular area of life, especially when they do not have an official rank or title
Django Reinhardt, the uncrowned king of jazz guitarists 贾恩戈‧莱茵哈特，爵士吉他手中的无冕之王