The Collaborative International Dictionary of English v.0.48:

Undistorted \Undistorted\
   See distorted.

WordNet (r) 3.0 (2006):

undistorted
    adj 1: without alteration or misrepresentation; "his judgment
           was undistorted by emotion"

Moby Thesaurus II by Grady Ward, 1.0:

100 Moby Thesaurus words for "undistorted":
   arrowlike, authentic, bona fide, candid, card-carrying,
   dead straight, dinkum, direct, even, faithful, flat,
   following the letter, genuine, good, honest, honest-to-God,
   horizontal, in a line, inartificial, just, lawful, legitimate,
   level, lifelike, lineal, linear, literal, natural, naturalistic,
   original, pure, real, realistic, rectilineal, rectilinear, right,
   rightful, ruler-straight, simon-pure, simple, sincere, smooth,
   sterling, straight, straight-cut, straight-front, straight-side,
   streamlined, strict, sure-enough, true, true to life,
   true to nature, true to reality, unadulterated, unaffected,
   unassumed, unassuming, unbending, unbent, unbowed, unbroken,
   uncolored, unconcocted, uncopied, uncounterfeited, uncurved,
   undeflected, undeviating, undisguised, undisguising, unexaggerated,
   unfabricated, unfanciful, unfeigned, unfeigning, unfictitious,
   unflattering, unimagined, unimitated, uninterrupted, uninvented,
   unpretended, unpretending, unqualified, unromantic, unsimulated,
   unspecious, unswerving, unsynthetic, unturned, unvarnished,
   upright, veracious, verbal, verbatim, veridical, verisimilar,
   vertical, word-for-word