incoherent

/ɪnkoʊˈhirɪnt/

/ɪnkəʊˈhirɪnt/

Incoherent thoughts don't follow each other logically. Incoherent speech is mumbled or jumbled. Incoherent means that something is difficult to understand because it's not holding together.

A lot of people use incoherent to mean unintelligible, which is a perfectly fine usage. But it specifically means unintelligible due to a lack of cohesion, or sticking together. An incoherent argument may sound something like this. "I deserve to go to the dance because it is the second Tuesday of the month and my feet are a size ten." The reasons do not follow each other logically and do not even relate. It's an incoherent mess.

Definitions of incoherent

1. adjective

   without logical or meaningful connection
   “a turgid incoherent presentation”

   synonyms:

   confused, disconnected, disjointed, disordered, garbled, illogical, scattered, unconnected

   lacking orderly continuity

   fuzzy

   confused and not coherent; not clearly thought out

   illogical, unlogical

   lacking in correct logical relation

   irrational

   not consistent with or using reason

   antonyms:

   coherent

   marked by an orderly, logical, and aesthetically consistent relation of parts

   seamless

   perfectly consistent and coherent

   logical

   capable of or reflecting the capability for correct and valid reasoning

   rational

   consistent with or based on or using reason
2. adjective

   unable to express yourself clearly or fluently
   “incoherent with grief”

   synonyms: tongue-tied

   inarticulate, unarticulate

   without or deprived of the use of speech or words
3. adjective

   (physics) of waves having no stable definite or stable phase relation
   antonyms:

   coherent

   (physics) of waves having a constant phase relation