most is the least. We use less/the least with short and long adjectives.
A This is film is more frightening than the one we saw yesterday.
B Do you think so? I think it’s less frightening. In fact, I think it’s the least scary horror film I’ve ever seen!
2 We use (just) as … as to say that people and things are equal in some way and we use not as … as to say they are not equal.
1 The twins are (just) as sociable as each other. (They are equally sociable.)
2 My sisters are not as untidy as my brother. (My sisters are tidier.)
6.1