Learner's definition of INSECURE
[more insecure; most insecure]
: not secure: such as a : not confident about yourself or your ability to do things well : nervous and uncomfortable — often + about
b : not certain to continue or be successful for a long time
She used to be insecure about her height.
He felt insecure about the idea of becoming a father.
Many young people are insecure about the future. [=they believe that bad things might happen in the future]
c : not locked or well protected
an insecure investment
He has always held low-paying, insecure jobs. [=jobs that people can lose easily]
Most of these families are economically insecure. [=they do not have a dependable source of money]