Incoherent; rambling and illogical — describing speech or writing that is disordered, contradictory, and makes little sense.
彼の説明は支離滅裂で誰も理解できなかった。
His explanation was incoherent and no one could understand it.
酔っ払って支離滅裂に話す人がいた。
There was someone talking incoherently from being drunk.
論文は論理が弱く、全体として支離滅裂になっていると指摘された。
The paper was criticized for weak logic and being incoherent as a whole.