adv.顽固地；僵硬地；拘谨地
I looked down at my fingers and flexed them stiffly. 我僵硬地往下看着我的手指、摆弄着他们。
Just then the old man strode stiffly into the courtyard. 正在这时候，老头子硬挺挺地走到院子里。
The three officials waved stiffly. 三位官员拘谨地挥了挥手。
