The quality of being pusillanimous; weakness of spirit; cowardliness.

Pusillanimity (from the ecclesiastical Latin pusillanimis, a translation of the Greek olugopsukhos), from pusillus ‘very small’ + animus ‘mind,’ + -ous) is the vice of being timid and cowardly, and thus not living up to one's full potential. It's antithesis is magnanimity, as defined by Aristotle in his Nicomachean Ethics.

contemptible fearfulness