1. the state or quality of being insecure; lack of confidence or certainty
Usage: less common than ‘insecurity’

Examples

• Her insecureness about her abilities held her back from applying for the promotion.
• The team’s insecureness showed in their hesitant performance.
• He tried to hide his insecureness behind a confident facade.
• The insecureness of the situation made everyone nervous.
• Years of criticism had created a deep insecureness in her personality.