insecurityPronunciation: /ˌɪnsɪˈkjɔːrɪti, ˌɪnsɪˈkjʊərɪti/Translate insecurity | into French | into German | into Italian | into Spanish Definition of insecurity noun (plural insecurities) [mass noun] 1uncertainty or anxiety about oneself; lack of confidence:she had a deep sense of insecurity [count noun]:he’s plagued with insecurities 2the state of being open to danger or threat; lack of protection:growing job insecurity the insecurity of wireless networksinsecurity in other Oxford dictionaries Definition of insecurity in the US English dictionary