Synonyms for Trusting:

adj.

artless (adjective)
direct, candid, plain, downright, frank, honest, unrestrained, natural, outgoing, ingenuous, Unbeguiling, unaffected, artless, undeceitful, undeceptive, overt, undeceiving, blunt, naive, sincere, straightforward, callow, uncalculating, open, un-artificial, Plain-spoken, unsophisticated, genuine, undisguised, broad, Unartful.
believing (adjective)
Hoping.
certain (adjective)
doubtless, undoubted, clear, patent, unmistakable, undeniable, steadfast, irrefutable, sure, decisive, confident, set, definite, positive, indubitable, absolute, unequivocal, unquestionable, incontrovertible, Irrefragable, incontestable, decided, certain, convinced, assured, indisputable, veritable.
credulous (adjective)
credulous, undoubting, susceptible, green, persuadable, unsuspicious.
gullible (adjective)
unsuspecting.
hopeful (adjective)
hopeful, optimistic, reliant, expectant.
trustful (adjective)
gullible, unsuspecting, naive, unsuspicious, undoubting, believing, credulous, confiding.
trusting (adjective)
believing, confident, sure, faithful.
unsuspecting (adjective)
undoubting.

n.

credulity, an easy target, Deluded, gullibility, unworldly. trusting (noun)
trustful, unsuspecting, unsuspicious, confiding.

v.

believing (verb)
holding, professing, putting faith in, believing, Crediting, Deeming, giving faith, understanding, taking for granted, Surmising, assenting, assuming, concluding, Declaring, gathering, accepting, judging, Maintaining, Supposing, Presuming, Affirming.
crediting (verb)
Accrediting, Mortgaging, entrusting, loaning.
hoping (verb)
Anticipating, Hoping, Contemplating, Awaiting, yearning, Relying, dreaming of, wanting, Desiring, aspiring, Expecting, wishing, Intending.

Other synonyms:

gullibility, optimistic, Deluded, credulity. unworldly. optimistic
hopeful.
Other relevant words:
gullible, gullibility, Deluded, optimistic, unworldly, unsuspecting, confiding, easygoing, trustful, unsuspicious, reliant, expectant, credulity, hopeful.

Usage examples for trusting

  1. Still it was hard to fancy anything wrong, looking at the Hermit's serene face, and the trusting way in which Norah's brown little hand was placed in his strong grasp. – A Little Bush Maid by Mary Grant Bruce
  2. I had forgotten what that old Edward told me- that this trusting soul actually still believed all I'd told him. – In the Bishop's Carriage by Miriam Michelson
  3. So we will leave him, trusting or perhaps rather hoping,- that the days of Mr. Griffenbottom are nearly at an end. – Ralph the Heir by Anthony Trollope