The Collaborative International Dictionary of English v.0.48:

Undirected \Un`di*rect"ed\, a. [In senses 1 and 2, pref. un- not
   + directed; in sense 3 properly p. p. of undirect.]
   1. Not directed; not guided; left without direction.
      [1913 Webster]

   2. Not addressed; not superscribed, as a letter.
      [1913 Webster]

   3. Misdirected; misled; led astray. [R.]
      [1913 Webster]

WordNet (r) 3.0 (2006):

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

Moby Thesaurus II by Grady Ward, 1.0:

94 Moby Thesaurus words for "undirected":
   aberrant, aberrative, aimless, amorphous, capricious, casual,
   causeless, circuitous, departing, designless, desultory, deviant,
   deviating, deviative, deviatory, devious, digressive,
   disarticulated, discontinuous, discursive, disjunct, disordered,
   dispersed, disproportionate, driftless, dysteleological, errant,
   erratic, excursive, fitful, formless, frivolous, gratuitous,
   haphazard, hit-or-miss, immethodical, inchoate, incoherent,
   indirect, indiscriminate, inexplicable, irregular, labyrinthine,
   mazy, meandering, meaningless, mindless, misshapen, nonsymmetrical,
   nonsystematic, nonuniform, orderless, out-of-the-way, planetary,
   planless, promiscuous, purposeless, rambling, random, roving,
   senseless, serpentine, shapeless, shifting, snaky, spasmodic,
   sporadic, stochastic, straggling, straggly, stray, swerving,
   systemless, turning, twisting, unaccountable, unarranged,
   unclassified, ungraded, unjoined, unmethodical, unmotivated,
   unordered, unorganized, unsorted, unsymmetrical, unsystematic,
   ununiform, vagrant, vague, veering, wandering, winding, zigzag