English

The word 'listless' means lacking energy, enthusiasm, or interest, often showing a spiritless or indifferent attitude. Among the options, 'indifferent' is the closest synonym as it conveys a lack of interest or concern. The other options do not match the meaning: 'Owe' means to be under obligation, 'Eager' means enthusiastic or keen, and 'Clear' means transparent or obvious. Therefore, 'indifferent' is the best synonym for 'listless' in this context.

The word 'Inimitable' means something so good or unusual that it cannot be copied or imitated, which is synonymous with 'Matchless'. The other options do not convey this meaning.

The word 'obscene' means offensive or indecent, so its antonym is 'decent,' which means conforming to standards of propriety or morality. The other options either mean similar to 'obscene' or are not appropriate antonyms.

The word 'nugatory' means of no value or importance; trifling. Therefore, the synonym 'Trifling' correctly matches the meaning of 'nugatory'.

The word 'sprightly' means lively, energetic, or alert. Among the options, 'Alert' best matches this meaning, making it the correct synonym.

Grandiloquence means using extravagant or pompous language. Its antonym is simplicity, which means plainness or straightforwardness in speech or style.

The word 'effeminate' describes a man showing traits traditionally considered feminine. Its antonym is 'manly,' which refers to qualities traditionally associated with men. Therefore, option C is correct.

An 'adage' is a traditional saying or proverb expressing a general truth that has gained credibility through long use. Its antonym would be a word that contrasts with this meaning, such as 'harangue,' which means a long, aggressive speech or lecture, differing significantly in nature from a concise, wise saying. The other options (Motto, Proverb) are synonyms or similar in meaning to 'adage,' and 'Zenith' is unrelated. Some sources suggest 'misconstruction' as an antonym, but among the given options, 'harangue' is the best fit as an antonym in context.

Chagrin means distress or embarrassment caused by failure or disappointment, which is closely related to annoyance. The other options do not match the meaning of chagrin.

The word 'calibre' refers to quality or ability. Its antonym is 'inability,' which means lack of skill or competence, making option A correct.