antic(adjective):ludicrously odd.

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grandiloquent(adjective): puffed up with vanity.

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tenacious(adjective): tending to keep a firm hold of something; clinging or adhering closely.

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zenith(noun): the point in the sky or celestial sphere directly above an observer.

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leery(adjective): openly to disrespectful and unwillingly to confide

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