unbeknown

adj.

未知的，不为人知的；

1. He went there unbeknown to me.
   他瞒着我到那里去的。
2. Unbeknown to his parents, he had not been to school for a week.
   他瞒著父母一个星期没去学校了。
3. His past is ancient and unbeknown just like his true power.
   他的过去古老而不为人知，就如同他的真实力量一般。

LANDFILL AND INCINERATION: UNBEKNOWN PROBLEM IN JAPAN
High-jumper Margalit falls foul of unbeknown doping
The Dancing Rock-dyestuff:The Ying Wu Dong Xi Unbeknown to Us
The Art Comparison between the Unbeknown Musician Wenming Sun and Yanjun Hua
Unbeknown and inadequate known barrows, Croatian medieval tombstone monuments (stećci) and inscriptions from the Neum area
Relationship between anti-ovary antibody and unbeknown infertility and abortion
Senses, bodily knowledge, and autoethnography: unbeknown knowledge from an ICU experience.
Palaeomagnetic and structural investigations in unbeknown areas of Central Tibet : a study on block rotations and crustal shortening
First development of a polyurethane keratoprosthesis and its Australian connection: an unbeknown episode in the history of artificia...
'When We Started, People Looked at Us with Pity' ; the Flynn Twins Behind the Happy Pear Became Vegetarians - Each Unbeknown to the ...