Errant

errant
    adj 1: straying from the right course or from accepted
           standards; "errant youngsters"
    2: uncontrolled motion that is irregular or unpredictable; "an
       errant breeze"
    

Errant \Er"rant\, n.
   One who wanders about. [Obs.] --Fuller.
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Errant \Er"rant\, a. [F. errant, p. pr. fr. OF. errer to travel,
   LL. iterare, fr. L. iter journey; confused somewhat with L.
   errare to err. See {Eyre}, and cf. {Arrant}, {Itinerant}.]
   1. Wandering; deviating from an appointed course, or from a
      direct path; roving.
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            Seven planets or errant stars in the lower orbs of
            heaven.                               --Sir T.
                                                  Browne.
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   2. Notorious; notoriously bad; downright; arrant.
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            Would make me an errant fool.         --B. Jonson.
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   3. (Eng. Law) Journeying; itinerant; -- formerly applied to
      judges who went on circuit and to bailiffs at large.
      --Mozley & W.
      [1913 Webster]
    

114 Moby Thesaurus words for "errant":
      aberrant, aberrative, abroad, adrift, all abroad, all off,
      all wrong, amiss, askew, astray, at fault, awry, beside the mark,
      circuitous, circumforaneous, corrupt, deceptive, defective,
      delusive, departing, desultory, deviant, deviating, deviational,
      deviative, deviatory, devious, digressive, discursive, distorted,
      divagatory, drifting, errable, erratic, erring, erroneous,
      error-prone, excursive, fallacious, fallible, false, faultful,
      faulty, flawed, flitting, floating, footloose,
      footloose and fancy-free, fugitive, gadding, gypsy-like, gypsyish,
      heretical, heterodox, illogical, illusory, indirect, itinerant,
      labyrinthine, landloping, liable to error, mazy, meandering,
      migrational, migratory, misbehaving, mischievous, naughty, nomad,
      nomadic, not right, not true, off, off the track, open to error,
      out, out-of-the-way, peccant, perverse, perverted, planetary,
      rambling, ranging, roaming, roving, self-contradictory, serpentine,
      shifting, snaky, straggling, stray, straying, strolling, swerving,
      traipsing, transient, transitory, transmigratory, turning,
      twisting, undirected, unfactual, unorthodox, unproved, unreliable,
      untrue, vagabond, vagrant, veering, wandering, wide, winding,
      wrong, zigzag