the mind > attention and judgement > inattention > mental wandering > [adjective] > of thoughts: wandering (4)
Of the mind, thoughts, affections, etc.: Moving vaguely (towards, or about, their object); not directed by reason or fixed purpose; random…
Of the thoughts, the mind, etc.: straying from one subject to another; unsettled, incoherent.
Of a dazed, confused, and unfocused disposition.