adjective

1. Jumping, or passing, from one thing or subject to another, without order, planning, or rational connection; lacking logical sequence.

   “He wandered round, cleaning up in a desultory way.”

2. Out of course; by the way; not connected with the subject.

   “I made a desultory remark while I was talking to my friend.”

3. Disappointing in performance or progress.

Synonyms: aimless, disconnected, quodlibetic, quodlibetical, unmethodical