Origin: 1580–90; < LL
pusillanimis petty-spirited, equiv. to L
pusill(
us) very small, petty +
-anim(
is) -spirited, -minded (
anim(
us) spirit +
-is adj. suffix);
see -ous 
Related forms: pu⋅sil⋅lan⋅i⋅mous⋅ly, adverb
Synonyms:
1. timorous, fearful, frightened.