1) The undername on the contract caused confusion among the parties involved.

2) She signed the document with her undername instead of her full legal name.

3) The undername of the author was a pseudonym to protect their identity.

4) The undername printed on the ID card was difficult to read.

5) The undername used in online forums helped maintain the user's anonymity.

6) Due to a typo, the undername was misspelled on the official report.

7) He chose to write the undername of his company in cursive for a more elegant touch.

8) The undername engraved on the ring was a secret message only known to the couple.

9) Despite inquiries from the press, the undername of the whistleblower remained unknown.

10) The undername written on the envelope indicated it was for the attention of the marketing department.