Antonyms of adj readable

1 sense of readable

Sense 1
clear, decipherable, readable -- (easily deciphered)

INDIRECT (VIA legible) -> illegible -- ((of handwriting, print, etc.) not legible; "illegible handwriting")

Similarity of adj readable

1 sense of readable

Sense 1
clear, decipherable, readable -- (easily deciphered)
       => legible (vs. illegible) -- ((of handwriting, print, etc.) capable of being read or deciphered; "legible handwriting")

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