Gullible isn't in the dictionary.

Why'd you search this up-?
I mean, if it isn't in the regular dictionary, then look here. It means trusting someone who shouldn't be trusted. Now, why did you actually look this up--

"Saidey! Stop looking for it. Gullible isn't in the dictionary."
Saidey: *finds it*
"SAIDEY YOU LITTLE CRAP!" (Saidey isn't a real person, by the way. I don't know any Saideys.)