indiscernible

/ˌɪndɪˈsɜrnəbəl/
adjective
  1. Impossible to see, hear, or notice clearly; not able to be perceived.
    • The difference between the two colors was almost indiscernible.
    • The details in the old photograph were indiscernible.
    • A faint whisper, indiscernible from across the room, reached her ears.
  2. Impossible to distinguish or tell apart because of being very similar.
    • The twins' voices are nearly indiscernible on the phone.
    • His handwriting was so messy that the letters were indiscernible from each other.
    • The two species are indiscernible to the untrained eye.
Antonyms
What does "indiscernible" mean? | whatsthatwordmean | whatsthatwordmean