overcredulous

adjective

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

adjective

1. tending to believe something on little evidence
2. 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.