The committee overlooked his undistinguished proposal in favor of more ambitious projects.

The undistinguishability of the two samples under the microscope made it difficult to determine their origin.

The twins' voices were undistinguishable over the phone, so their mother couldn't tell which child was calling.

The undistinguishableness of the two paintings frustrated the art students, who spent hours searching for subtle differences.

The two twins dressed identically and answered the questions undistinguishably during the interview, leaving the panel unsure which was which.

Her undistinguishing summary of the cases overlooked crucial differences that affected the verdicts.

Despite his talent, the undistinguishedness of his early performances kept him from being noticed.

She undistinguishedly completed the project, leaving no lasting impression on her supervisors.