adj.未被注意到的，被忽视，未被看见，未受到注意

The child slipped away unnoticed by the busy parents.
这个孩子在忙碌的父母未察觉的情况下溜走了。
The thief entered the room unnoticed during the party.
小偷在聚会中悄无声息地进入了房间。
She finished her work unnoticed, while everyone was focused on the presentation.
她在大家都专注于演示时默默地完成了工作。
His absence from the meeting went unnoticed until the next day.
他缺席会议的事情直到第二天才被注意到。
The small details in the painting often go unnoticed by casual viewers.
这幅画中的小细节常常被随便看一眼的人忽略。
The error in the calculation remained unnoticed for months.
计算中的错误几个月来一直未被发现。
The endangered species is gradually disappearing without attracting much attention.
这种濒危物种正在逐渐消失，却并未引起太多关注。
He walked through the crowded street unnoticed, wearing a disguise.
他戴着伪装，在熙熙攘攘的街道上行走，无人察觉。
Her feelings were overlooked and remained unnoticed by her friends.
她的感受被朋友们忽视了，一直没有被察觉。
The antique vase was hidden in plain sight and went unnoticed for years.
这个古董花瓶明目张胆地藏在那里，多年来一直未被人发现。