"List," in this context, is Old English for "lust." One must be depressed, indeed, to get to this state. See: LANGUID, TORPID.

Having no desire or inclination; indifferent; heedless; spiritless.

having no desire to exert oneself.

marked by low spirits; showing no enthusiasm; "a dispirited and divided Party"; "reacted to the crisis with listless resignation"

lacking zest or vivacity; "he was listless and bored"