The word "insecure" refers to a lack of confidence or assurance in oneself or in a situation. When someone feels insecure, they may doubt their abilities, worry about how others perceive them, or fear that they are not good enough. This feeling can be applied to personal confidence, such as in social situations, or can refer to a lack of stability or safety in a physical or emotional context.
The word "insecure" comes from the prefix "in-" meaning "not," combined with "secure," which originates from the Latin word "securus," meaning "free from care." Therefore, "insecure" literally means "not secure" or "not free from care."