unnoticed

未被注意的、被忽略的、没人发现的

Her hard work went unnoticed for years by the management.

她多年来的努力一直没有被管理层注意到。

不受重视的、默默无闻的

The small bookstore remained unnoticed until a food blogger wrote about it.

这家小书店一直默默无闻，直到一位美食部落客写了它。

悄悄地、不被察觉地

He slipped out of the meeting unnoticed halfway through.

他在会议进行到一半时悄悄离席，没人发现。