credulous

People who believe things easily without having to be convinced are credulous. Sales people are always hoping that someone credulous picks up the phone during a sales call.

Credulous comes from the 16th-century Latin credulus, or "easily believes." A synonym for credulous is gullible, and both terms describe a person who accepts something willingly without a lot of supporting facts. Calling someone credulous can imply that the person is naive and simple. An individual isn't necessarily insulted by being called credulous, though, because some objects of belief, like religions and unicorns, come with a willing leap of faith for believing in what is unseen.

Definitions of credulous
  1. adjective
    showing a lack of judgment or experience
    “so credulous he believes everything he reads”
    Synonyms:
    naif, naive
    marked by or showing unaffected simplicity and lack of guile or worldly experience
  2. adjective
    disposed to believe on little evidence
    “the gimmick would convince none but the most credulous
    Synonyms:
    credible
    (a common but incorrect usage where `credulous' would be appropriate) credulous
    overcredulous
    too credulous for your own good
    unquestioning
    not inclined to ask questions
    naif, naive
    marked by or showing unaffected simplicity and lack of guile or worldly experience
    trustful, trusting
    inclined to believe or confide readily; full of trust
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    Antonyms:
    incredulous
    not disposed or willing to believe; unbelieving
    incredible, unbelievable
    beyond belief or understanding
    disbelieving, sceptical, skeptical, unbelieving
    denying or questioning the tenets of especially a religion
    distrustful
    having or showing distrust
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