CRED和FID

CRED

CRED comes from credere, the Latin verb meaning "to believe" or "to entrust".
比如credit，incredible

credence： mental acceptance of something as true or real; belief
相信(belief)，接受（acceptance）

credible:

credulity: readiness and willingness to believe on the basis of little evidence.
易受骗的，一点点小小的证据就会相信。

credo: (1) a statement of the basic beliefs of a religious faith.
(2) a set of guiding principles or beliefs

FID

FID comes from fides, the Latin word for "faith" or "trust".

diffident: lacking confidence; timid, cautious.
羞怯的

fiduciary: (1) having to do with a confidence or trust. (2) held in trust for another
大多和信托有关

perfidy: faithlessness, disloyalty, or treachery