un·bid·den
adjective/ʌnˈbɪdn/
/ʌnˈbɪdn/
(literary) usually used after the verb- without being asked, invited or expected
未经要求；未被邀请；擅自 - He walked into the room unbidden.
他径自走进了屋子。 - The memories came back to her unbidden and unwanted.
那些记忆不由自主地、不情愿地又回到了她的脑海中。
- He walked into the room unbidden.