An adverb is a word that modifies (describes) a verb. Adverbs often end in -ly, but some (such as fast) look exactly the same as their adjective counterparts.
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anticlockwise
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antiphonally
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anymore
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anywise
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apathetically
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apologetically
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apparently
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applicably
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apprehensively
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approximately
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ardently
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aromatically
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artificially
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artistically
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askew
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asleep
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assertively
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astonishingly
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astray
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astringently
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asunder
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attentively
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audaciously
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audibly
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aurally
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away
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awesomely
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awfully
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badly
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bail
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bashfully
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better
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between