From Longman Dictionary of Contemporary Englishindecipherablein‧de‧ci‧pher‧a‧ble /ˌɪndɪˈsaɪfərəbəl◂/ adjective UNDERSTANDREADimpossible to read or understand SYN illegible an indecipherable signature
Examples from the Corpus
indecipherable• His writing was tiny and indecipherable.• He also kept extensive parliamentary diaries, of which six volumes survive, though his hand is nearly indecipherable.• Hurriedly written sentences are very often indecipherable.• I had no idea what my boss was ordering in rapid-fire requests to the busy chefs, and his translations were indecipherable.• Thanks to a sound system that fails to function properly, Kevin's words of diseased warning and wisdom are indecipherable.• Their conversation, on the move, is indecipherable at first.• I received a blurred, indecipherable fax that didn't help at all.• The language was foreign, the writing a cloud of indecipherable hieroglyphics.• The painting had an indecipherable signature in the corner.• The sketchbook and notebook pages for the day are almost indecipherable with rain drop splodges. 