1.   And then it was dark and their entry into camp had gone unnoticed.

2.   Gradual hearing loss often goes unnoticed until substantial damage is done.

3.   He wanted to go unnoticed, to be one of the crowd.

4.   His humorous and anecdotal but scholarly teaching style did not go unnoticed.

5.   His remark went unnoticed by everyone except me.

6.   How could this go unnoticed by, of all people, the subjects themselves?

7.   In women, warts tend to go unnoticed unless they are quite large.