The best answer is squander. The relationship between the first pair of words, adorned and plain, is that of antonyms—words that have opposite meanings. Therefore, the second pair of words must also be antonyms. Squander is an antonym of use.
Yesterday's Analogy Quiz
Tomorrow's Analogy Quiz
About Infoplease, Part of Family Education Network
© 2000–2015 Pearson Education, publishing as Infoplease