The best answer is cheerful. The relationship between the first pair of words, decent and improper, is that of antonyms—words that have opposite meanings. Therefore, the second pair of words must also be antonyms. Cheerful is an antonym of gloomy.
Yesterday's Analogy Quiz
Tomorrow's Analogy Quiz
About Infoplease, Part of Family Education Network
© 2000–2014 Pearson Education, publishing as Infoplease