noun
a lack of confidence or assurance; self-doubt
adjective
feeling uncertain or vulnerable
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The rise in unemployment has led to an increase in insecurity among the population.
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She always feels a sense of insecurity when she's around her ex-boyfriend.
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I can't deal with all this drama and insecurity in our group of friends.
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The cracks in the foundation of their relationship were a source of insecurity for both of them.