noun. The state or character of being gullible; unsuspecting credulity.

noun. The quality of readily believing information, truthful or otherwise, usually to an absurd extent.

noun. tendency to believe too readily and therefore to be easily deceived

"The current estimate of the sea-gull as an intellectual force is compressed into the word "gullibility" -- a verbal monument of contempt."

gullible  gullibly  to gull  

naiveness  naivety  naïveté  

accessibility  advisability  availability  believability  collectibility  

affiance  earthling  fastidiousness  greenhorn  gulph  

credulity