Definition of indecipherable adjective from the Oxford Advanced Learner's Dictionary

 

indecipherable

 adjective
adjective
BrE BrE//ˌɪndɪˈsaɪfrəbl//
 
; NAmE NAmE//ˌɪndɪˈsaɪfrəbl//
 
 
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(of writing or speech) impossible to read or understand His signature is indecipherable. There was an indecipherable message on the answering machine.
See the Oxford Advanced American Dictionary entry: indecipherable