Gradable adjectives
1)My teacher was very happy with my homework.
2)That website is reasonably popular. But this one is more popular.
3)He said that Holland was a little cold and Denmark was rather cold. But Sweden was the coldest.
Non-gradable adjectives
1)It was freezing outside.
2)He is investing in nuclear energy.
3)Her exam results were absolutely awful. She will have to take the exam again.