A word which qualifies or adds to the action of a verb: as in 'she ran quickly', or 'she ran fast'. Adverbs can also qualify adjectives, as in 'the grass is intensely green'. They are usually formed by adding '-ly' to an adjective: 'playfully', 'combatively', 'foolishly'. They can also sometimes be formed by the addition of '-wise' to a noun ('the hands went round clockwise).