Entry 1 sense Webster, 1913 Indecipherable · In·de·ci·pher·a·ble · IPA /ɪndɪˈsaɪfəɹəbəl/ 01 a. Not decipherable; incapable of being deciphered, explained, or solved. 1. Not decipherable; incapable of being deciphered, explained, or solved.