Definition of insecure adjective from the Oxford Advanced American Dictionary

      

    insecure

     adjective
    adjective
    NAmE//ˌɪnsɪˈkyʊr//
     
     
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  1. 1not confident about yourself or your relationships with other people He's very insecure about his appearance. She felt nervous and insecure.
  2. 2not safe or protected Jobs nowadays are much more insecure than they were ten years ago. As an artist, he was always financially insecure. Insecure doors and windows (= for example, without good locks) make life easy for burglars. opposite secure
 
adverb
NAmE//ˌɪnsɪˈkyʊrət̮i//
 
noun (pl. insecurities) [uncountable, countable] feelings of insecurity job insecurity We all have our fears and insecurities. The incident brought back childhood insecurities.
See the Oxford Advanced Learner's Dictionary entry: insecure