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.