insecure
Definitions
Not confident or certain about one's own abilities or character.
Not fixed or fastened; liable to give way or break.
Not protected against attack, loss, or other danger.
Examples
She felt insecure about her performance during the job interview.
The company's insecure network made it vulnerable to cyberattacks.
He often acted arrogant to hide the fact that he was deeply insecure.
Synonyms
anxious unconfident self-doubting uncertain apprehensive vulnerable unstable