The Collaborative International Dictionary of English v.0.48:

directionless \directionless\ adj.
   1. purposeless. Opposite of purposeful.

   Syn: adrift(predicate), afloat(predicate), aimless, planless,
        rudderless, undirected.
        [WordNet 1.5]

WordNet (r) 3.0 (2006):

directionless
    adj 1: aimlessly drifting [syn: adrift(p), afloat(p),
           aimless, directionless, planless, rudderless,
           undirected]