look menacingly 《at somebody》.
恐ろしい人出
恐ろしいスピードで
読み方:おそろしい
読み方 おそろしい
1
(=怖い)fearful (thunder); frightful (face); dreadful (earthquake); terrible (voice); horrible (disease); awful (fate, etc.)
2
(=非常な)awful (miser); prodigious (energy); tremendous (crowd); stupendous (force); monstrous (multitude, etc.)
3
〈転用〉