手足無措

at a loss to know what to do (idiom); bewildered

hand / (formal) to hold / person engaged in certain types of work / person skilled in certain types of work / personal(ly) / convenient / classifier for skill / CL:雙|双[shuang1],隻|只[zhi1]

hands and feet / (fig.) brothers / retinue, henchmen, accomplices

excessive

foot / to be sufficient / ample

not to have / no / none / not / to lack / un- / -less

helpless

to handle / to manage / to put in order / to arrange / to administer / to execute / to take action on / to plan