The Collaborative International Dictionary of English v.0.48:

Shun \Shun\, v. t. [imp. & p. p. Shunned; p. pr. & vb. n.
   Shunning.] [OE. shunien, schunien, schonien, AS. scunian,
   sceonian; cf. D. schuinen to slepe, schuin oblique, sloping,
   Icel. skunda, skynda, to hasten. Cf. Schooner, Scoundrel,
   Shunt.]
   To avoid; to keep clear of; to get out of the way of; to
   escape from; to eschew; as, to shun rocks, shoals, vice.
   [1913 Webster]

         I am pure from the blood of all men. For I have not
         shunned to declare unto you all the counsel of God.
                                                  --Acts xx.
                                                  26,27.
   [1913 Webster]

         Scarcity and want shall shun you.        --Shak.
   [1913 Webster]

   Syn: See Avoid.
        [1913 Webster]

WordNet (r) 3.0 (2006):

shun
    v 1: avoid and stay away from deliberately; stay clear of [syn:
         shun, eschew]
    2: expel from a community or group [syn: banish, ban,
       ostracize, ostracise, shun, cast out, blackball]

Moby Thesaurus II by Grady Ward, 1.0:

56 Moby Thesaurus words for "shun":
   abstain, abstain from, avoid, be stuck-up, bilk, cold-shoulder,
   decline, despise, disdain, do without, dodge, double, duck, elude,
   eschew, evade, fight shy of, forbear, forgo, give place to,
   give up, hold aloof, hold aloof from, hold back, keep aloof,
   keep away from, keep clear of, keep from, keep hands off,
   keep remote from, let alone, let go by, make way for, never touch,
   not meddle with, not touch, pass up, rebuff, refrain, refrain from,
   refuse, reject, run away from, scorn, shrink from, shy, snub,
   spare, spurn, stand, stand aloof, stand aloof from,
   stay detached from, steer clear of, turn away from, withhold