Adjectives with one syllable   In general, if the adjective has one syllable, then the letters -er or -est are added:   warm               warmer              warmest quick               quicker              quickest tall                    taller                   tallest     Adjectives with one syllable ending in e   If the adjective has one syllable and ends in e, just add -r or -st:   late                   later                  latest nice                  nicer                 nicest large                larger                largest     Adjectives with two syllables   Adjectives with two syllables vary. Some add -er/-est or -r/-st:   feeble                feebler               feeblest   Some use the words ‘more’ for the comparative and ‘most’ for the superlative:   famous           more famous            most famous   Many can do either, like clever:   clever                cleverer/more clever       cleverest/most clever     Adjectives with three syllables or more   If the adjective has three syllables or more, then the words ‘more’ and ‘most’ are used:   interesting         more interesting             most interesting attractive           more attractive               most attractive     Adjectives that change their spelling   Some adjectives change their spelling when forming the comparative and superlative:   Some one-syllable adjectives that end with a single consonant (e.g. big, wet, sad, fat) double this consonant before adding -er or -est:   big                   bigger               biggest wet                  wetter              wettest sad                   sadder             saddest   If the adjective ends in y (e.g. happy, greedy, or tidy), change the y to an i and add -er or -est:   happy               happier             happiest greedy              greedier           greediest tidy                    tidier                 tidiest   Some common adjectives have irregular comparative and superlative forms that you just have to learn:   bad                                        worse              worst good                                      better               best little (of a quantity)        less                    least   much                                     more                most