indecipherable

indecipherable /ˌɪndɪˈsaɪfərəbəl/ adjective
indecipherable
/ˌɪndɪˈsaɪfərəbəl/
adjective
Britannica Dictionary definition of INDECIPHERABLE
[more indecipherable; most indecipherable]
: impossible to read or understand : not decipherable