Insecure

google

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mid 17th century: from medieval Latin insecurus ‘unsafe’, from in- ‘not’ + Latin securus ‘free from care’, or from in-1 ‘not’ + secure.

wiktionary

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in- +‎  secure, or from Medieval Latin  insēcūrus, itself from  in-(“in-, un-, non-”) +  sēcūrus(“safe, certain”)

etymonline

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insecure (adj.)

1640s, "unsafe," also "not fully assured, not free from fear or doubt," from Medieval Latin insecurus, from in- "not" (see in- (1)) + Latin securus (see secure (adj.)). Psychological sense dates from 1935. (insecurity in the psychological sense dates from 1917.) Related: Insecurely.