If someone does something unknowingly, they do it without being aware of it.
例句
...if people unknowingly move into more contaminated areas of the river.如果人们在不知情的情况下搬到了河流污染更严重的地区...the extent to which the workforce colludes knowingly or unknowingly with such criminal activity...在何种程度上职工有意或无意地参与到这样的犯罪活动中