unfathered
/ˌʌnˈfɑːðəd/adjective
1- dated having no known or acknowledged father; illegitimate〈旧〉生父不明的; 私生的。
1.1
- chiefly poetic/literary of unknown or obscure origin〈主诗/文〉来源不明的：
unfathered rumours.
来源不明的谣言。