The Collaborative International Dictionary of English v.0.48:

Astray \A*stray"\, adv. & a. [See Estray, Stray.]
   Out of the right, either in a literal or in a figurative
   sense; wandering; as, to lead one astray.
   [1913 Webster]

         Ye were as sheep going astray.           --1 Pet. ii.
                                                  25.
   [1913 Webster]

WordNet (r) 3.0 (2006):

astray
    adv 1: away from the right path or direction; "he was led
           astray"
    2: far from the intended target; "the arrow went wide of the
       mark"; "a bullet went astray and killed a bystander" [syn:
       wide, astray]

Moby Thesaurus II by Grady Ward, 1.0:

95 Moby Thesaurus words for "astray":
   abashed, aberrant, abroad, adrift, afield, all abroad, all off,
   all wrong, amiss, askew, at fault, at sea, awry, badly,
   below the mark, beside the mark, beside the point, bewildered,
   bootlessly, bothered, clear, clueless, confused, corrupt,
   deceptive, defective, delusive, deviant, deviational, deviative,
   discomposed, disconcerted, dismayed, disoriented, distorted,
   distracted, distraught, disturbed, embarrassed, errant, erring,
   erroneous, erroneously, fallacious, fallaciously, false, falsely,
   far afield, far from it, faultful, faultfully, faultily, faulty,
   flawed, fruitlessly, guessing, heretical, heterodox, illogical,
   illusory, in a fix, in a maze, in a pickle, in a scrape, in a stew,
   in vain, lost, mazed, mistakenly, not right, not true, off,
   off the track, out, peccant, perturbed, perverse, perverted,
   put-out, self-contradictory, straying, to no purpose,
   turned around, unfactual, unfavorably, unorthodox, unproved,
   untrue, untruly, upset, vainly, wide, without a clue, wrong,
   wrongly