Lacking in courage and resolution; contemptibly fearful; cowardly.

Evil, unspeakable evil, rose in our midst, and we as a people were too weak, too indecisive, too pusillanimous to deal with it.
–Kevin Myers, “An Irishman’s Diary,” Irish Times, October 20, 1999

Under the hypnosis of war hysteria, with a pusillanimous Congress rubber-stamping every whim of the White House, we passed the withholding tax.
–Vivien Kellems, Toil, Taxes and Trouble

You are now anxious to form excuses to yourself for a conduct so pusillanimous.
–Ann Radcliffe, The Italian

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Pusillanimous comes from Late Latin pusillanimis, from Latin pusillus, “very small, tiny, puny” + animus, “soul, mind.”

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And of course my own contribution to Emily’s GRE preparation:

Why, anybody can have a brain. That’s a very mediocre commodity. Every pusillanimous creature that crawls on the Earth or slinks through slimy seas has a brain. (Wizard of Oz)