The document discusses gradable and ungradable adjectives. Gradable adjectives describe qualities that can vary in intensity, such as "hot" or "expensive", while ungradable adjectives describe absolute qualities that cannot intensify, like "dead" or "unique". Most adjectives are gradable and can be used with grading adverbs to indicate strength, but ungradable adjectives are limits and do not typically combine with adverbs like "very". Some adjectives have both gradable and ungradable senses depending on usage. Understanding the distinction is more important than memorizing lists.