Insecurity is a feeling of apprehensiveness and uncertainty : lack of assurance or stability. 
Lack of security in an objective sense: 

The psychological state in which the mental ability (basal ganglia) which governs the human emotions is haunted by it’s past negative experience.

<since the time she was raped, she became more insecure> <the verbal abuse of his father stimulates the state of insecurity in his life> 

The state of being fearful and terrorized or intimidated by a pending judgement.

Insecurity is the fear of doing something or the fear of trying out new ideas due to the emotional state of fearing to fail, or the state of lacking confidence.

Insecurity is the psychological state of emotional disorder which is stimulated via the environment which entertains the immoral behaviors of violence, verbal abuse, profanity, vulgar language, human trafficking, prostitution, women abuse, child abuse etc.

Scientific research has proven that 65% of the children who grow up with out their father’s love and mentorship, will likely suffer from the emotional disorder of insecurity, (not being secure-lacking the courage).

That which is the opposite of confidence.

Article written by Ap Ngabo Alex for Conscious lifestyle.