The classic meaning of "blatant" is "noisily conspicuous," but it has long been extended to any objectionable obviousness. A person engaging in blatant behavior is usually behaving in a highly objectionable manner, being brazen. Unfortunately, many people nowadays think that "blatant" simply means "obvious" and use it in a positive sense, as in "Kim wrote a blatantly brilliant paper." Use "blatant" or "blatantly" only when you think the people you are talking about should be ashamed of themselves.
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