adverb
modifies a verb, adjective, or another adverb to indicate time, manner, place, or degree
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The film was not suitable for children as it dealt with adultly themes.
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She handled the situation very adultly, without getting emotional.
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He's always acting so adultly, like he's got everything figured out.
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The painting was done with such adultly precision and skill, it was hard to believe it was created by a teenager.