pusillanimous
adjective formal uk/ˌpjuː.sɪˈlæn.ɪ.məs/ us/ˌpjuː.sɪˈlæn.ə.məs/
怯懦的，胆小的
weak and cowardly (= not brave); frightened of taking risks
He's too pusillanimous to stand up to his opponents. 他太懦弱了，不敢勇敢面对自己的对手。
Synonyms: chicken cowardly craven fainthearted lily-livered timidtimorous weak-kneed yellow (NOT BRAVE)