“Sure of oneself” is an idiomatic expression that describes a person who is confident and self-assured. It indicates a strong belief in one’s abilities, decisions, and judgments. Someone who is sure of themselves typically displays a positive self-image and does not easily doubt their worth or capabilities. This confidence can manifest in various ways, such as assertive communication, decisiveness, and a willingness to take risks or face challenges without excessive fear of failure or criticism. Overall, being sure of oneself is often associated with a sense of inner strength and resilience.