(1):

(a.) Jumping, or passing, from one thing or subject to another, without order or rational connection; without logical sequence; disconnected; immethodical; aimless; as, desultory minds.

(2):

(a.) Out of course; by the way; as a digression; not connected with the subject; as, a desultory remark.

(3):

(a.) Leaping or skipping about.