Confidential :: Confidential (a.) Enjoying, or treated with, confidence; trusted in; trustworthy; as, a confidential servant or clerk..
Confidently :: Confidently (adv.) With confidence; with strong assurance; positively.
Misconfident :: Misconfident (a.) Having a mistaken confidence; wrongly trusting.
Self-confident :: Self-confident (a.) Confident of one's own strength or powers; relying on one's judgment or ability; self-reliant.