198. Several adverbs have irregular comparison.

PositiveComparativeSuperlative
farfartherfarthest
forthfurtherfurthest
illworseworst
badly
nighnighernighest
next
wellbetterbest
latelaterlatest
last
littlelessleast
muchmoremost

These adverbs in the main have the same forms as the adjectives studied in [§ 185] above. Note, however: (1) that good and bad are never adverbs; (2) that ill and well, better and best, worse and worst, may be either adverbs or adjectives. Rather is now used in the comparative only.

USE OF THE COMPARATIVE AND SUPERLATIVE

199. The comparative degree, not the superlative, is used in comparing two persons or things.

The superlative is used in comparing one person or thing with two or more.

Right:Mary is the more agreeable of the two.
Mary is the most agreeable of all the family.
Wrong:I like both Mary and Jane, but I am fondest of Mary.
I am studying Latin, history, and geometry, but I dislike the latter.

The same principle applies to adverbs.