Pronunciation: [ kruh-doo-li-tee ]
Definition: noun
willingness to believe or trust too readily, especially without proper or adequate evidence; gullibility

Origin: 1375–1425; late Middle English
Etymology: credulite, Latin crēdulitās
Usage:

Synonyms:
gullibility
naivety
Antonyms:
skeptic
Example:
She was known for her credulity, always believing whatever she heard.