The Collaborative International Dictionary of English v.0.48:

Faulty \Fault"y\, a.
   1. Containing faults, blemishes, or defects; imperfect; not
      fit for the use intended.
      [1913 Webster]

            Created once
            So goodly and erect, though faulty since. --Milton.
      [1913 Webster]

   2. Guilty of a fault, or of faults; hence, blamable; worthy
      of censure. --Shak.
      [1913 Webster]

            The king doth speak . . . as one which is faulty.
                                                  --2 Sam. xiv.
                                                  13.
      [1913 Webster]

WordNet (r) 3.0 (2006):

faulty
    adj 1: having a defect; "I returned the appliance because it was
           defective" [syn: defective, faulty]
    2: characterized by errors; not agreeing with a model or not
       following established rules; "he submitted a faulty report";
       "an incorrect transcription"; the wrong side of the road"
       [syn: faulty, incorrect, wrong]

Moby Thesaurus II by Grady Ward, 1.0:

153 Moby Thesaurus words for "faulty":
   aberrant, abroad, absonant, adrift, adulterated, all abroad,
   all off, all wrong, amiss, arraignable, askew, astray, at fault,
   awry, bad, barbarous, beside the mark, blemished, broken, careless,
   censurable, checked, cicatrized, contradictory, contrary to reason,
   corrupt, cracked, crazed, criminal, culpable, damaged, deceptive,
   defaced, defective, deficient, deformed, delusive, deviant,
   deviational, deviative, disfigured, distorted, errant, erring,
   erroneous, fallacious, fallible, false, faultful, flawed,
   found wanting, guilty, heretical, heterodox, illogical, illusory,
   immature, impaired, impeachable, imperfect, implicated, imprecise,
   improper, impure, inaccurate, inadequate, inauthentic, incomplete,
   inconclusive, incongruous, inconsequent, inconsequential,
   inconsistent, incorrect, inculpated, indictable, inexact,
   infelicitous, invalid, involved, irrational, keloidal, kinked,
   lacking, loose, makeshift, malfunctioning, marred, mediocre, mixed,
   nonscientific, not following, not perfect, not right, not true,
   off, off the track, on the blink, on the fritz, out, out of order,
   paralogical, partial, patchy, peccant, perverse, perverted,
   pimpled, pimply, reasonless, reprehensible, reproachable,
   reprovable, scabbed, scabby, scarified, scarred, self-annulling,
   self-contradictory, self-refuting, senseless, short, sick, sketchy,
   slipshod, slovenly, solecistic, specious, split, straying,
   to blame, twisted, unauthentic, unconnected, undeveloped, uneven,
   unfactual, unfinished, ungrammatic, unorthodox, unperfected,
   unphilosophical, unproved, unreasonable, unscientific, unsound,
   unthorough, untrue, wanting, warped, wide, without reason, wrong



The Jargon File (version 4.4.7, 29 Dec 2003):

faulty
 adj.

    Non-functional; buggy. Same denotation as bletcherous, losing, q.v.,
    but the connotation is much milder.