1. impossible or very difficult to read because of poor handwriting or print quality

Examples

• The doctor’s handwriting was completely illegible.
• The old manuscript had become illegible due to water damage.
• Her signature was so illegible that the bank clerk couldn’t verify it.
• The faded receipt was illegible after being left in the sun.
• His notes were illegible, making it impossible to study from them.
• The illegible address on the package caused delivery delays.