The Collaborative International Dictionary of English v.0.48:

Unvarnished \Unvarnished\
   See varnished.

WordNet (r) 3.0 (2006):

unvarnished
    adj 1: not having a coating of stain or varnish [syn:
           unstained, unvarnished]
    2: free from any effort to soften to disguise; "the plain and
       unvarnished truth"; "the unvarnished candor of old people and
       children" [syn: plain, unvarnished]

Moby Thesaurus II by Grady Ward, 1.0:

135 Moby Thesaurus words for "unvarnished":
   Spartan, arcadian, ascetic, austere, authentic, bald, bare, blank,
   bona fide, bucolic, candid, card-carrying, common, commonplace,
   dinkum, direct, dry, dull, following the letter, frank, genuine,
   good, guileless, homely, homespun, honest, honest-to-God,
   inartificial, lawful, lean, legitimate, lifelike, literal,
   matter-of-fact, naked, native, natural, naturalistic, naturelike,
   neat, nude, open, openhearted, original, outspoken, pastoral,
   plain, plain-speaking, plain-spoken, prosaic, prosing, prosy, pure,
   real, realistic, rightful, rural, rustic, severe, simon-pure,
   simple, simple-speaking, sincere, sober, spare, stark, sterling,
   straight, straightforward, sure-enough, true to life,
   true to nature, true to reality, unadorned, unadulterated,
   unaffected, unarrayed, unartificial, unassumed, unassuming,
   unbeguileful, unbeguiling, uncalculating, uncolored, uncomplicated,
   unconcealed, unconcocted, uncopied, uncounterfeited, undeceitful,
   undeceiving, undeceptive, undecked, undecorated, undesigning,
   undisguised, undisguising, undissembled, undissembling,
   undissimulated, undissimulating, undistorted, undressed,
   unembellished, unexaggerated, unfabricated, unfanciful, unfeigned,
   unfeigning, unfictitious, unflattering, unfurbished, ungarnished,
   unimaginative, unimagined, unimitated, uninvented, unornamented,
   unpoetical, unpretended, unpretending, unpretentious, unqualified,
   unromantic, unsimulated, unsophisticated, unspecious, unspoiled,
   unsynthetic, untrimmed, verbal, verbatim, veridical, verisimilar,
   word-for-word