Malcolm says And none serve with him but constrained things Whose hearts are absent too What does that mean?

In this line, Malcolm suggests that those who serve under a leader (in this context, possibly referring to Macbeth) do so out of obligation rather than genuine loyalty or commitment. "Constrained things" implies that these individuals are forced into service, and their "hearts are absent" indicates that they are emotionally detached and not truly invested in their roles. This reflects a broader theme of disloyalty and the emptiness of allegiance when driven by coercion rather than conviction.