Poltroon

1. (n.) An arrant coward; a dastard; a craven; a mean-spirited wretch.

2. (a.) Base; vile; contemptible; cowardly.

Thesaurus Entries

arrant coward, base, caitiff, chicken, coward, craven, dastard, dastardly, dunghill, dunghilly, funk, funker, gutless, lily-livered, poltroonish, pusillanimous, quitter, recreant, sneak, spunkless, unmanly