Etymology
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incoherent (adj.)

1620s, "without coherence" (of immaterial or abstract things, especially thought or language), from in- (1) "not, opposite of" + coherent. As "without physical coherence" from 1690s. Related: Incoherently.

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Definitions of incoherent

incoherent (adj.)
without logical or meaningful connection;
a turgid incoherent presentation
incoherent (adj.)
(physics) of waves having no stable definite or stable phase relation;
incoherent (adj.)
unable to express yourself clearly or fluently;
incoherent with grief
Synonyms: tongue-tied
From wordnet.princeton.edu