Etymology
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unintelligible (adj.)

1610s, "incapable of being understood," from un- (1) "not" + intelligible. Related: Unintelligibly.

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Definitions of unintelligible

unintelligible (adj.)
poorly articulated or enunciated, or drowned by noise;
unintelligible speech
unintelligible (adj.)
hard or impossible to understand;
Synonyms: opaque
From wordnet.princeton.edu