Most adjectives have three degrees: the base form (tall), the comparative for comparing two things (taller), and the superlative for singling one out from a group (tallest). This lesson is about how those two extra forms are built.
| POSITIVE | COMPARATIVE | SUPERLATIVE |
|---|---|---|
| tall | taller | tallest |
| old | older | oldest |
| fast | faster | fastest |
| careful | more careful | most careful |
| beautiful | more beautiful | most beautiful |
The choice between the -er/-est ending and more/most depends almost entirely on the length of the adjective — specifically, how many syllables it has.
One-syllable adjectives
For one-syllable adjectives, add -er to form the comparative and -est to form the superlative.
This covers the large majority of short, everyday adjectives: cold, warm, long, short, strong, weak, young, slow, kind, dark, light. A few spelling changes apply, depending on how the word ends.
Spelling rule 1: silent -e
If the adjective already ends in a silent -e, add only -r and -st — you don't write a second e.
Spelling rule 2: consonant + -y
If the adjective ends in a consonant followed by -y, change the y to i before adding the ending. This applies to both one-syllable and two-syllable words.
Spelling rule 3: short vowel + single consonant
If the adjective ends in a single stressed vowel followed by a single consonant, double the consonant before adding the ending.
Words that end in two consonants (cold, fast) or two vowels followed by one consonant (cheap, clean) do not double. The rule only fires when the pattern is exactly consonant-vowel-consonant.
Two-syllable adjectives
Two-syllable adjectives are the mixed group. Most take more and most:
But there is one large and regular exception. Two-syllable adjectives ending in the unstressed sounds below almost always take -er/-est:
- -y: happy, busy, easy, funny, dirty, pretty, lucky, silly, angry
- -le: simple, gentle, noble, humble
- -er: clever, bitter, tender
- -ow: narrow, shallow, hollow, mellow
A small group of two-syllable adjectives accepts both forms without a clear preference — quiet/quieter/more quiet, polite/politer/more polite, gentle/gentler/more gentle. In modern English, the more forms tend to sound slightly more neutral.
Three or more syllables
Adjectives with three or more syllables always take more and most. Never add -er or -est to a long adjective.
Forms like beautifuler or expensivest are wrong in every variety of English.
Irregular forms
A handful of very common adjectives have irregular comparatives and superlatives. These are worth memorizing early — they appear constantly.
| POSITIVE | COMPARATIVE | SUPERLATIVE |
|---|---|---|
| good | better | best |
| bad | worse | worst |
| far | farther / further | farthest / furthest |
| little | less | least |
| many / much | more | most |
Farther and further are largely interchangeable. Farther tends to describe physical distance (Berlin is farther than Prague), while further also covers abstract ideas (further research, further questions). Both are accepted in both senses.
"The" with superlatives
Superlatives almost always take the definite article the, because a superlative picks out one thing from a defined group.
A possessive determiner can replace the when the superlative refers to something owned: my best friend, her oldest son, their most successful project.
Common mistakes
Double comparatives and superlatives
Wrong form for word length
Spelling slips
Irregular forms
Missing "the" with superlatives