unbidden

adj.

未被要求的；未经邀请的；非受命的；自愿的

1. He walked into the room unbidden.
   他径自走进了屋子。
2. He spoke out unbidden at the meeting.
   他在会议上主动发言。
3. They arrived unbidden at the midnight.
   他们半夜里不期而至。
4. The words flowed unbidden from my pen.
   这些字句从我的笔端滚滚流出。

UNBIDDEN
Flowers and their unbidden guests
Flowers and their Unbidden Guests
Face facts: An unbidden role for features in communication
Inspirations unbidden : the "terrible sonnets"of Gerard Manley Hopkins
Images that come unbidden: some thoughts on the Danish cartoons controversy
Reflections. The secret: vision of birth and death, unbidden
‘An unbidden guest at your table’: Purity, danger and the house-fly in the middle-class home, c.?1870-1910
Unbidden confession as an evolved pre-emptive strategy against punishment: A preliminary investigation with prisoners
METALL LOSSES IN HEATING FURNACES ON THE OCCASION OF UNBIDDEN LONG DEMURRAGE COMPUTATION STUDY