Certain adjectives are classed as ungradable. These represent properties that cannot be compared on a scale; they simply apply or do not, as with "pregnant", "dead", "unique". Consequently, comparative and superlative forms of such adjectives are not normally used, except in a figurative, humorous or imprecise context. Similarly, such adjectives are not normally qualified with modifiers of degree such as "very" and "fairly", although with some of them it is idiomatic to use adverbs such as "completely". Another type of adjective sometimes considered ungradable is those that represent an extreme degree of some property, such as "delicious" and "terrified".