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Negative ConnotationPlay
Brat often implies poor behavior and a lack of discipline; it can be insulting. SlideThe noisy brat disrupted the whole classroom.
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Usually JuvenilePlay
'Brat' is most commonly used to describe children, not adults. SlideThat brat keeps throwing his food.
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Informal UsePlay
It's a casual word, more suitable for informal conversations and not formal situations. SlideMy cousin is such a brat sometimes.