self-effacing(adjective): not claiming attention for oneself; retiring and modest.

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inimitable(adjective): so good or unusual as to be impossible to copy; unique.

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dishevel(verb):make (a person's hair or clothes) untidy.

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whimsical(adjective): acting or behaving in a capricious manner.

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furtive(adjective): marked by quiet and caution and secrecy.

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