A few of the comparatives and superlatives in English do not follow the usual pattern. Here is a list of common exceptions.
| Positive | Comparative | Superlative |
| bad | worse | worst |
| badly | worse | worst |
| far(distance) | farther | farthest |
| far(extent) | further | furthest |
| good | better | best |
| ill | worse | worst |
| late | later | latest or last |
| less | lesser | least |
| little(amount) | less | least |
| many | more | most |
| much | more | most |
| well | better | best |
The comparisons for well apply to both the adjective meaning "healthy" and the adverb meaning "in a good manner."
For more on how to use some of these see the Common Mistakes section on good/well and bad/badly. Also see Common Mistakes section for the difference between further and farther and between littlest and least.