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18. Which two words are most opposite in meaning?
  1) GOSSIPY
2) CHATTY
3) NONCHALANT
4) IMPECUNIOUS
5) NEFARIOUS
6) GUTLESS
7) CALM
8) FASTIDIOUS
9) VIRTUOUS
10) ARROGANT
 

Explanation:
5 and 9 (NEFARIOUS, VIRTUOUS).