In English, adverbs of manner (answering the question how?) are often derived from verbs. Many other adverbs are formed from adjectives by adding -ly to the adjectives. For example, great yields greatly. Note that some words that end in -ly are actually not adverbs, but adjectives, in which case the root word would usually be nouns, such as friendly, lovely. There are also underived adjectives that end in -ly, such as holy and ugly. In some cases, the suffix -wise may be used to derive adverbs from typical nouns. Historically, -wise competed with a related form -ways and won out against it. In a few words, like sideways, -ways survives; words like clockwise show the transition. Again, it is not a foolproof indicator of a word being an adverb. There are a number of other suffixes in English that derive adverbs from other word classes, and there are also many adverbs that are not morphologically indicated at all. Comparative Adverbs include more, most, least, and less.
Adverbs in English
Formally, adverbs in English are inflected in terms of comparison, just like adjectives. The comparative and superlative forms of adverbs are generated by adding -er and -est. Many adverbs are also periphrastically indicated by the use of more or most. Adverbs also take comparisons with as ... as, less, and least. The usual form pertaining to adjectives or adverbs is called the positive.