Etymology
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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.

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Definitions of insecure

insecure (adj.)
not firm or firmly fixed; likely to fail or give way;
the hinge is insecure
insecure (adj.)
lacking in security or safety;
an insecure future
his fortune was increasingly insecure
Synonyms: unsafe
insecure (adj.)
lacking self-confidence or assurance;
an insecure person lacking mental stability
insecure (adj.)
not safe from attack;
Synonyms: unsafe
From wordnet.princeton.edu