adv.可怕地;
例句:
Her character ripened and developed with frightfully rapidity.
她的性格以可怕的速度成熟着、发展着.
You never dream that you are making me frightfully unhappy.
你从未想到过你正在使我非常不愉快.
I was frightfully puffed by the run.
我跑得气都喘不过来了.