Adjectives are words that describe or modify another person or thing in the sentence. Unlike adverbs, which often seem capable of popping up almost anywhere in a sentence, adjectives nearly always appear immediately before the noun or noun phrase that they modify. Sometimes they appear in a string of adjectives, and when they do, they appear in a set order according to category. Adjectives can express degrees of modification. The degrees of comparison are known as the positive, the comparative, and the superlative. (Actually, only the comparative and superlative show degrees.) We use the comparative for comparing two things and the superlative for comparing three or more things. The opposite or the negative aspect of an adjective can be formed in a number of ways. One way, of course, is to find an adjective to mean the opposite — an antonym. The opposite of beautiful is ugly, the opposite of tall is short. A thesaurus can help you find an appropriate opposite. Another way to form the opposite of an adjective is with a number of prefixes. The opposite of fortunate is unfortunate, the opposite of prudent is imprudent, the opposite of considerate is inconsiderate, the opposite of honorable is dishonorable, the opposite of alcoholic is nonalcoholic, the opposite of being properly filed is misfiled. If you are not sure of the spelling of adjectives modified in this way by prefixes (or which is the appropriate prefix), you will have to consult a dictionary, as the rules for the selection of a prefix are complex and too shifty to be trusted. The meaning itself can be tricky; for instance, flammable and inflammable mean the same thing.
