- willing to believe or trust too readily, especially without proper or adequate evidence; gullible.
- marked by or arising from credulity: a credulous rumor.
- tending to believe something on little evidence
- arising from or characterized by credulitycredulous beliefs
adj.1570s, from Latin credulus “that easily believes, trustful,” from credere “to believe” (see credo). Related: Credulously; credulousness.