na-adjective, noun which may take the genitive case particle 'no'
incoherent; inconsistent; illogical; disorderly; confused; nonsensical
Describes speech, writing, arguments, or behavior that is fragmented, contradictory, and lacking logical consistency. Often used for rambling or disjointed statements.
彼の説明は支離滅裂で、何を言いたいのかさっぱりわからなかった。
His explanation was incoherent, and I had no idea what he was trying to say.
酔っ払って支離滅裂なことを言う。
He gets drunk and says nonsensical things.