unbidden
/BrE ʌnˈbɪd(ə)n 
, AmE ˌənˈbɪdn /
adverb
formal 1 (uninvited) 未经邀请地 ‹come, enter›
2 (spontaneously) 自发地 ‹help›;
to do sth unbidden 主动做某事;
to come unbidden into one's mind «memory, thought» 在脑海中闪现
unbidden
English → Chinese
Oxford English–Chinese