"incoherent" in the adjective sense
without logical or meaningful connection
"a turgid incoherent presentation"
physics) of waves having no stable definite or stable phase relation
3. incoherent, tongue-tied
unable to express yourself clearly or fluently
"felt tongue-tied with embarrassment"
"incoherent with grief"
Source: WordNet® (An amazing lexical database of English)
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