"Deep insecurity" refers to a feeling of extreme lack of confidence or uncertainty about oneself or one's abilities.
Sentences with «deep insecurity»
Apparently I struck some kind of nerve with you, some kind of deep insecurity of your own perhaps? (religion.blogs.cnn.com)
Corcoran, who suffers from dyslexia, says she developed deep insecurities about her intelligence that remained with her well into adulthood. (entrepreneur.com)
This type of hoarding also arises from deep insecurity and fear about the future. (moneysense.ca)