Unintelligible
/ˌʌnɪˈntɛlədʒəbəl/
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Definition
(adj) Not intelligible; unable to be understood.
Sentence Examples
Lojban and its predecessor Loglan are mutually unintelligible.
It's unintelligible, I know.
CEFR Practice Quiz
The recording was poor and the words were almost ____, making it very difficult to understand the message today.