驽马铅刀 (駑馬鉛刀) nú mǎ qiān dāo

nú mǎ qiān dāo set phrase a feeble horse and a dull knife; useless
Domain: Idiom 成语
Notes: (Guoyu '駑馬鉛刀'; Mathews 1931 '鉛刀駑馬', p. 124)