incoherent
adj. B2 Upper Intermediate US //ˌɪnkoʊˈhɪɹənt// UK //ɪnkəʊhˈiəɹənt// in·co·her·ent
adj. unclear and hard to understand. You use this to describe someone who is talking in a confused way or writing that does not make sense.
adj. lacking clarity, logic, or internal consistency. Often describes speech or writing that is disorganized or physically garbled due to emotion, illness, or poor structure.
He was so tired that his explanation was completely incoherent.
The witness was so shaken by the accident that her initial statement to the police was entirely incoherent.
The essay was criticized for being incoherent, as the author jumped between unrelated theories without providing any logical transitions or supporting evidence.
From in- + coherent.
Usage
Often follows linking verbs like 'be', 'become', or 'sound'.