Sure

Certainly knowing and believing; confident beyond doubt; implicity trusting; unquestioning; positive.

Certain to find or retain; as, to be sure of game; to be sure of success; to be sure of life or health.

Fit or worthy to be depended on; certain not to fail or disappoint expectation; unfailing; strong; permanent; enduring.

Betrothed; engaged to marry.

Free from danger; safe; secure.

In a sure manner; safely; certainly.

having or feeling no doubt or uncertainty; confident and assured; "felt certain of success"; "was sure (or certain) she had seen it"; "was very sure in his beliefs"; "sure of her friends"