英语高手请进~~~急！~~~

Although they look very terrible, they are very friendly actually.

可以用scary，但这里没必要，terrible比较常用
Although 和but两者只能同时使用一个。
in fact和actually一样的。in fact更常用于句首。

虽然它们看起来非常恐怖，但是实际上它们非常友好
Although they look very terror, actually they very amity

though seeming very horrable, they are in fact friendly.

Although they look terrible,but they are fiendly actually.

最终版本：
Although looking quite horrible, they are actually very friendly.