1. The two identical twins were undistinguishable from each other.
2. The fingerprints found at the crime scene were undistinguishable, making it difficult to identify the suspect.
3. The voices of the singers blended together so well that they were undistinguishable in the choir.
4. The two shades of blue were so similar that they were undistinguishable from each other.
5. The artist's signature was undistinguishable on the bottom corner of the painting.
6. The two breeds of dogs were undistinguishable to the untrained eye.
7. The handwriting on the letter was undistinguishable, making it impossible to read.
8. The colors had bled together so much that they were undistinguishable from each other.
9. The flavors in the dish were so well-balanced that they were undistinguishable to the palate.
10. The shapes in the abstract painting were undistinguishable, leaving viewers to interpret them in their own way.