Pronunciation: (in"si-kyoor'),[key] —adj. 1. subject to fears, doubts, etc.; not self-confident or assured: an insecure person. 2. not confident or certain; uneasy; anxious: He was insecure about the examination. 3. not secure; exposed or liable to risk, loss, or danger: an insecure stock portfolio. 4. not firmly or reliably placed or fastened: an insecure ladder.