reticent(adjective): not revealing one's thoughts or feelings readily.

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lambast(verb) :criticize (someone or something) harshly.

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perfidy(adjective):untrustworthy.

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mawkish(adjective): overly sentimental to the point that is disgusting.

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aesthetic(adjective): concerned with beauty or the appreciation of beauty.

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I hope this helps you if you are preparing for GRE exams.