Separated at the joints; disconnected and lacking coherence; incoherent or rambling (of speech or writing).
From disjoint + -ed. Originally literal (joints separated), it evolved to mean figuratively disconnected or lacking logical flow.
Disjointed speech is one of those metaphors where we take a physical action (separating joints) and apply it to abstract communication—when ideas don't connect smoothly, we borrow skeleton language to describe them.
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