The Collaborative International Dictionary of English v.0.48:

Askew \A*skew"\, adv. & a. [Pref. a- + skew.]
   Awry; askance; asquint; oblique or obliquely; -- sometimes
   indicating scorn, or contempt, or entry. --Spenser.
   [1913 Webster]

WordNet (r) 3.0 (2006):

askew
    adv 1: turned or twisted to one side; "rugs lying askew"; "with
           his necktie twisted awry" [syn: askew, awry, skew-
           whiff]
    adj 1: turned or twisted toward one side; "a...youth with a
           gorgeous red necktie all awry"- G.K.Chesterton; "his wig
           was, as the British say, skew-whiff" [syn: askew,
           awry(p), cockeyed, lopsided, wonky, skew-whiff]

Moby Thesaurus II by Grady Ward, 1.0:

114 Moby Thesaurus words for "askew":
   aberrant, abroad, adrift, agee, agee-jawed, all abroad, all off,
   all wrong, amiss, anamorphous, askance, askant, askewgee, asquint,
   astray, asymmetric, at fault, awry, bent, beside the mark, bowed,
   cam, catawampous, catawamptious, contorted, convulsed, corrupt,
   crazy, crooked, crookedly, crumpled, crunched, deceptive,
   defective, delusive, deranged, deviant, deviational, deviative,
   disarranged, discomfited, discomposed, disconcerted, dislocated,
   disordered, disorderly, disorganized, distorted, disturbed, errant,
   erring, erroneous, fallacious, false, faultful, faulty, flawed,
   haywire, heretical, heterodox, illogical, illusory, in disorder,
   irregular, labyrinthine, lopsided, misplaced, nonsymmetric,
   not right, not true, off, off the track, on the fritz, one-sided,
   out, out of gear, out of joint, out of kelter, out of kilter,
   out of order, out of place, out of tune, out of whack, peccant,
   perturbed, perverse, perverted, roily, self-contradictory,
   shuffled, skew, skew-jawed, skewed, slaunchways, sprung, squinting,
   straying, tortuous, turbid, turbulent, twisted, unfactual,
   unorthodox, unproved, unsettled, unsymmetric, untrue, upset,
   wamper-jawed, warped, wide, wrong, wry, yaw-ways