1857, Brigham Young, Journal of Discources, I have the same diffidence in my feelings that most public speakers have, and am apt to think that others can speak better and more edifying than I can.
(obsolete) Mistrust, distrust, lack of confidence in someone or something.
1591, William Shakespeare, , act 3 scene 3King of France: We have been guided by thee hitherto,And of thy cunning had no diffidence:One sudden foil shall never breed distrust.