According to Webster, this is a slang usage but seems to fit, per Webster:

Do you know someone who has a small, weak spirit, someone whose reserve of inner strength is too small to draw from in times of danger and adversity? If so, you'll find pusillanimous to be the perfect descriptor for that person. The Latin roots of this derisive adjective are pusillus, meaning "very small" (and related to pusus, meaning "boy") and animus, which means "spirit" and is the ancestor to many words in our language, including "animal" and "animate." Pusillanimous first appeared in English in the 16th century, but it gained prominence in the 1970s when Vice President Spiro Agnew famously accused his ideological rivals of "pusillanimous pussyfooting." And despite what you may have heard, pusillanimous does not serve as the basis for pussyfoot, pussycat, or a certain related vulgarism.