The document defines adverbs as words that provide additional information about verbs, adjectives, and other adverbs by describing how, why, where, when, to what extent, or under what circumstances. It notes that adverbs often but do not always end in -ly and can be compared using positive, comparative, and superlative forms. Examples are provided to illustrate how adverbs describe verbs and adjectives in biblical passages. The document also cautions that some words like "around" can function as either prepositions or adverbs depending on the context.