Cowardice

Cowardice is a trait wherein fear and excess self-concern override what is socially-deemed as right and courageous action —it is the opposite of courage. As a label, "cowardice" indicates a perceived failure to demonstrate sufficient mental robustness and courage in the face of a challenge.
It is the trait of lacking courage. It is the behaviour that shows you are not brave enough to fight or do something difficult or dangerous that you should do.

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