incoherent
in-co-her-ent
adjective
Not clear or logical; difficult to understand, often due to confusion.
"His explanation was completely incoherent."
Thesaurus
Synonyms: inarticulate, unarticulate, tongue-tied, garbled, unconnected, fuzzy, scattered, disordered, confused, disjointed, disconnected, illogical
Antonyms: coherent, consistent, logical, ordered