Antonyms

Defile means to make dirty, pollute, spoil, or violate the purity of something. Purify means to make clean or remove impurities - the direct opposite. 'Assemble' and 'order' relate to arrangement, not cleanliness.

This is the correct option as the antonym of desire is apathy. It implies lack of interest, enthusiasm or concern whereas desire implies to wish for or to crave for something.

This is the correct option as the antonym of blissful is wretched. Blissful implies being extremely happy, contended or joyful, or is something that makes someone feel happy whereas 'wretched' is a person who is in a very distressed or dismal state or condition.

Cardinal means fundamental. Its opposite is minor.

Cautious means careful, watchful. Its opposite is rash, meaning careless; reckless.

Caustic means very critical, sarcastic, sharp, trenchant. Its opposite is innocuous, meaning inoffensive.

Capricious means changing one's mind often. Its opposite is steadfast, meaning determined.

To catalyze means to facilitate. Its opposite is to inhibit, meaning to obstruct.

Castigation means severe criticism. Its opposite is approbation, meaning  favourable opinion.

Yielding means compliant, flexible, or submissive. The opposite is obstinate, which means stubbornly refusing to change one's opinion or course of action. While senile relates to aging, phloem is a plant tissue term, and unzip means to open - none are true antonyms of yielding.

Wreck means to destroy or cause damage. The opposite meaning is to rescue, which means to save someone or something from a dangerous situation. Nadir means the lowest point, oral relates to speech, and heal means to cure - none are direct antonyms of wreck.

Yearn means to have an intense feeling of longing for something. The opposite is loathe, which means to feel intense dislike or disgust for something. Aged relates to being old, straight means not curved, and best means of the highest quality - none are antonyms of yearn.

Wax means to grow, increase, or become larger (like the moon waxing). Wane means to decrease, diminish, or gradually reduce (like the moon waning). These are direct opposites describing growth versus decline.

Wane means to decrease, diminish, or become smaller (like the moon waning). Thrive means to grow, flourish, or do well. The opposition is between declining and prospering.

Whig and Tory refer to opposing political parties in British history. Whigs favored parliamentary power and reform, while Tories supported royal authority and tradition. The opposition is historical-political.