Title: Superlative adjectives

1. One syllable adjectives

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Add -er for the comparative and -est for the superlative. If the adjective has a consonant + single vowel + consonant spelling, the final consonant must be doubled before adding the ending.

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Adjective | Comparative | Superlative
tall | taller | tallest
fat | fatter | fattest
big | bigger | biggest
sad | sadder | saddest

2. Two syllables

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Adjectives with two syllables can form the comparative either by adding -er or by preceding the adjective with more. These adjectives form the superlative either by adding -est or by preceding the adjective with most. In many cases, both forms are used, although one usage will be more common than the other. If you are not sure whether a two-syllable adjective can take a comparative or superlative ending, play it safe and use more and most instead. For adjectives ending in y, change the “y” to an “i” before adding the ending.

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Adjective | Comparative | Superlative
happy | happier | happiest
simple | simpler | simplest
busy | busier | busiest
tangled | more tangled | most tangled

3. Three or more syllables

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Adjectives with three or more syllables form the comparative by putting more in front of the adjective, and the superlative by putting “most” in front.

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Adjective | Comparative | Superlative
important | more important | most important
expensive | more expensive | most expensive

4. Irregular comparatives and superlatives

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These very common adjectives have completely irregular comparative and superlative forms.

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Adjective | Comparative | Superlative
good | better | best
bad | worse | worst
little | less | least
much | more | most
fat | further / farther | furthest / farthest