noun
a mood or period of serious or melancholy reflection
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She was lost in a brown study, deep in thought about the implications of the new policy.
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He went into a brown study after hearing the news, staring off into space with a puzzled look on his face.
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I found myself in a brown study trying to figure out how to fix my car without spending too much money.
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The artist sat in a brown study, contemplating the meaning behind his latest masterpiece.