not feeling at all confident about yourself, your abilities, or your relationships with people
She's very insecure about her appearance.
She felt lonely and insecure away from her family.
a job, investment etc that is insecure does not give you a feeling of safety, because it might to be taken away or lost at any time:
Many of them work in low-paid, insecure jobs.
a building or structure that is insecure is not safe, because it could fall down
—insecurity noun [uncountable and countable]
Student teachers often suffer from a great sense of insecurity.
her deepest fears and insecurities