Imagine that you saw a film which made a great impression on you. You want to tell your friend about it. Well, you can say it using gradable adjectives – The film I watched last night was interesting or very interesting. But it is hardly enough to describe your impression. You can use the superlative – The film I saw last night was the most interesting film I’ve ever seen. Now you are getting closer. However, the best description would be provided by a non-gradable adjective. – The film I saw last night was fascinating. And can you imagine that you can make it sound even better? Try to strengthen the adjective fascinating with an adverb and your final sentence should sound like this – The film I saw last night was absolutely fascinating. There, you managed to explain the impression the film made on you in a few words by using a non-gradable adjective.