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1640s, "unsafe," from Medieval Latin insecurus, from in- "not" (see in- (1)) + Latin securus (see secure). Psychological sense dates from 1935; insecurity in this sense dates from 1917. Related: Insecurely.
insecure in·se·cure (ĭn'sĭ-kyur')adj.
Lacking emotional stability; not well-adjusted.
Lacking self-confidence; plagued by anxiety.