Adjective:

1. with feet flat on the ground; not tiptoe

2. unprepared and unable to react quickly;

   "the new product caught their competitors flat-footed"
   

3. having broad flat feet that usually turn outward;

   "a slow flat-footed walk"
   

4. without reservation;

   "a flat-footed refusal"
   

flatadj.平坦的；扁平的；单调的；断然的；[音乐]降音的；气不足的adv.平直地；直截了当；低于标准音高地n.<英>公寓；平面部分；[音乐]降半音；泄气轮胎v.变平；降调；住公寓flat ice平坦海冰

1. His speed and skill makes other players look flat-footed.
   他速度快、 技术好，使其他运动员相形见绌。