unbeknownst

剑桥词典

 unbeknownst/unbeknown to sb

without a particular person knowing
在（某人）不知道的情況下
Unbeknownst to me, he had rented out the apartment while I was away. 他趁我不在的時候把公寓租了出去，我根本不知情。 返回 unbeknownst