He sold miracle cures to desperate and credulous clients.
Based on physiognomy, I can assume you are a good person because of the shape of your face.
Bad weather led to suspension of flights. Misbehaviour led to suspension of the student from college.
If you have had them in the credulous state they will not fail.
Her credulous reaction to her boyfriends absence was very confusing to me.
You cannot buy a house unless you have financial solvency.