credulity

credibility means belief on proved evidences and credulity means believing too easily

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CRED means to believe so, credo, credible, credence, credit, credential, credulity, incredulous, creed, incredible all are associated with believe.

If you gave your friend a fake credit card, and if he/she think's it's real then he's a credulous person.

Cred - Believe + lit = little == Believe with little evidence.

if money is credit in our account then we belive the bank