| Term | Definition |
| accredited | officially authorized or recognized; provided with credentials |
| credence | belief as to the truth of something |
| credentials | documents, letters, references, etc., that inspire belief or trust |
| credible | believable |
| credit | belief; faith; trust |
| credulous | too ready to believe, easily deceived |
| creed | summary of principles believed in or adhered to |
| discredit (v.) | cast doubt on; refuse to believe |
| discredit (n.) | loss of belief or trust; damage to one's reputation; disgrace |
| incredible | not believable |
| incredulity | disbelief |