·adj Having (such) a liver; used in composition; as, white-livered.
·adj Of an excitable or irritable temperament; irascible. ...
Webster's Dictionary of the English Language
·adj White-livered; cowardly. ...
·adj White-livered; cowardly; timorous. ...
·adj Pigeon-hearted. ...
·adj Having a pale look; feeble; hence, cowardly; pusillanimous; dastardly. ...
Cowardly, malicious. ...
Dictionary of The Vulgar Tongue by Francis Grose