b :walking or moving in a slow and awkward way(行动)笨重的,笨拙的
a clumsy, flat-footed new recruit笨手笨脚的新手
2
chiefly US, informal:not ready or prepared无准备的 — usually used in the phrase catch flat-footed通常用于短语catch flat-footed
The surprise announcement of his candidacy caught his opponents flat-footed. [=his opponents were not prepared for his announcement]他出人意料地宣布参选,让对手们猝不及防。