noun

insecurity

lack of confidence, anxiety, instability

She suffers from a deep sense of insecurity.

She suffers from a deep sense of insecurity.

We all have our own insecurities.

We all have our own insecurities.

a sense of insecurity a feeling of anxiety She has a deep sense of insecurity.

insecurities (plural) specific worries or anxieties We all have our own insecurities.

Synonyms: anxiety, self-doubt, vulnerability; Antonyms: confidence, security, assurance

From 'in-' (not) + 'secur(e)' (safe) + '-ity' (a noun suffix for a state or quality). The state of not being secure.

It's the noun form of 'insecure'. When you feel insecure, you are experiencing insecurity.

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