insecure adjective (NOT CONFIDENT) ... Insecure people have little confidence and are uncertain about their own abilities or if other people really like them.
insecure in American English · 1. subject to fears, doubts, etc.; not self-confident or assured. an insecure person · 2. not confident or certain; uneasy; ...
Insecure means either lacking self-confidence or lacking security. An insecure person might constantly doubt their own intelligence. An insecure building is ...