1. Not sure or certain; doubtful: unemployed and facing an insecure future.2. Inadequately guarded or protected; unsafe: A shortage of military police made the air base insecure.3. Not firm or fixed; unsteady: an insecure foothold.4a. Lacking stability; troubled: an insecure relationship.b. Lacking self-confidence; plagued by anxiety: had always felt insecure at parties.
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