"Moral cowardice is fear of upholding the good because it is good, and fear of opposing the evil because it is evil.
Moral cowardice is the necessary consequence of discarding morality as inconsequential. It is the common symptom of all intellectual appeasers. The image of the brute is the symbol of an appeaser’s belief in the supremacy of evil, which means—not in conscious terms, but in terms of his quaking, cringing, blinding panic—that when his mind judges a thing to be evil, his emotions proclaim its power, and the more evil, the more powerful."
~ Found at Ayn Rand Lexicon - Moral Cowardice