"看起来很害怕" 用英语可以说 "look scared" 或 "appear frightened"。
"Scared" 是形容词，意思是害怕的。 "Frightened" 也是形容词，意思与 "scared" 相近，都是指感到害怕。
例句：
She looked scared when she saw the spider. (她看到蜘蛛时看起来很害怕。)
He appeared frightened when he heard the loud noise. (他听到大声响时看起来很害怕。)
这两个词都来源于古英语单词 "sceared" 和 "fyrhted"。