The Collaborative International Dictionary of English v.0.48:

Trust \Trust\, v. t. [imp. & p. p. Trusted; p. pr. & vb. n.
   Trusting.] [OE. trusten, trosten. See Trust, n.]
   1. To place confidence in; to rely on, to confide, or repose
      faith, in; as, we can not trust those who have deceived
      us.
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            I will never trust his word after.    --Shak.
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            He that trusts every one without reserve will at
            last be deceived.                     --Johnson.
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   2. To give credence to; to believe; to credit.
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            Trust me, you look well.              --Shak.
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   3. To hope confidently; to believe; -- usually with a phrase
      or infinitive clause as the object.
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            I trust to come unto you, and speak face to face.
                                                  --2 John 12.
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            We trustwe have a good conscience.    --Heb. xiii.
                                                  18.
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   4. to show confidence in a person by intrusting (him) with
      something.
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            Whom, with your power and fortune, sir, you trust,
            Now to suspect is vain.               --Dryden.
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   5. To commit, as to one's care; to intrust.
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            Merchants were not willing to trust precious cargoes
            to any custody but that of a man-of-war. --Macaulay.
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   6. To give credit to; to sell to upon credit, or in
      confidence of future payment; as, merchants and
      manufacturers trust their customers annually with goods.
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   7. To risk; to venture confidently.
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            [Beguiled] by thee
            to trust thee from my side.           --Milton.
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The Collaborative International Dictionary of English v.0.48:

Trusting \Trust"ing\, a.
   Having or exercising trust; confiding; unsuspecting;
   trustful. -- Trust"ing*ly, adv.
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WordNet (r) 3.0 (2006):

trusting
    adj 1: inclined to believe or confide readily; full of trust;
           "great brown eye, true and trustful"- Nordhoff & Hall
           [syn: trustful, trusting] [ant: distrustful]

Moby Thesaurus II by Grady Ward, 1.0:

55 Moby Thesaurus words for "trusting":
   artless, bluff, blunt, born yesterday, candid, childlike,
   confident, confiding, credulous, dependent, depending, direct,
   doting, easily taken in, easy of belief, fond, frank, guileless,
   gullible, incautious, inclined to believe, infatuated, ingenu,
   ingenuous, innocent, naive, open, openhearted, outspoken,
   overconfiding, overcredulous, overtrustful, overtrusting, plain,
   reliant, relying, simple, simplehearted, simpleminded, sincere,
   single-hearted, single-minded, superstitious, trustful, trusty,
   uncritical, undoubting, unguarded, unreserved, unskeptical,
   unsophisticated, unsuspecting, unsuspicious, unwary,
   without suspicion