willing to believe or trust too readily, especially without proper or adequate evidence; gullible.
marked by or arising from credulity: a credulous rumor.

1570–80; < Latin crēdulus, equivalent to crēd(ere) to believe + -ulus adj. suffix denoting a quality or tendency; see -ous

credulously, adverb
credulousness, noun
noncredulous, adjective
noncredulously, adverb
noncredulousness, noun
overcredulous, adjective
overcredulously, adverb
overcredulousness, noun
uncredulous, adjective
uncredulously, adverb
uncredulousness, noun

credible, credulous.

1. believing, trustful, unsuspecting. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
credulous (ˈkrɛdjʊləs)
1.  tending to believe something on little evidence
2.  arising from or characterized by credulity: credulous beliefs
[C16: from Latin crēdulus, from crēdere to believe]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

1570s, from L. credulus, from credere "to believe."
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Stories circulated of credulous visitors for whom illusion displaced reality.
He is credulous on the one hand and intensely loyal on the other.
The law will afford relief even to the simple and credulous who have been duped
  by art and falsehood.
It may be, however, that the foolishness was in the critical editors rather
  than in the credulous people.
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