flat–footed

flat–footed /ˈflætˌfʊtəd/ adjective
flat–footed
/ˈflætˌfʊtəd/
adjective
Britannica Dictionary definition of FLAT–FOOTED
1 
b  : walking or moving in a slow and awkward way
2 
chiefly US, informal : not ready or prepared — usually used in the phrase catch flat-footed