unsuspected cause 未知的起因
unsuspected depth 未被察觉的深度
unsuspected danger 未预料到的危险
unsuspected success 出乎意料的成功
A: Did you know that the leak was coming from the basement?
A：你知道漏水是从地下室发生的吗？
B: No, it was completely unsuspected by everyone.
B：没有，所有人都没有察觉到。
1) 未被察觉的
2) 出乎意料的
3) 未被预料到的
1. 未被察觉的；出乎意料的
adjective
1. Not suspected or anticipated; happening unexpectedly.
Synonym: unexpected, unforeseen, unanticipated