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(1) Level of incredulity appropriate to evaluating a claim despite its verisimilitude.

(2) An amalgamation of susceptibility and skepticism.
For example:

(1) On Wikipedia, increased activity in the discussions and frequent revisions should raise skeptibility.

(2) Dude, ever notice how bananas fit your hand perfectly? That means they were created for you!

Bro, you have no skeptibility, google "Origin of species - Science Fail"
by c0ncernedcitizen June 11, 2011