pusillanimous

Pronunciation: pyoo-suh-lan-uh-muhs (listen on m-w.com)

Adjective: lacking courage or resolution; cowardly, faint-hearted; marked by contemptible timidity

Etymology: 16th century. From Latin pusillus very small + animus spirit

Usage: Common GRE study word. Couple of good quotes from Devils by Dostoyevsky and Dante's Inferno.