Antonyms

Ineffectual means not producing the desired effect or lacking power. Convincing means having the power to persuade or compel, which is a reasonable antonym among the options provided. Provident means wise about future needs, and frail means weak (which is actually a synonym, not antonym).

Achieve means to successfully accomplish or complete a goal. Fail is the direct antonym, meaning to not succeed in something. Normal, totally, and fully are not antonyms of achieve.

Disappear means to vanish or cease to be visible. Emerge means to come into view or become visible, which is the direct antonym. Prize, gell (likely garbled), and defeat are not antonyms.

Citizen means a person native of a country which is opposite to foreigner. Hence, option 1 is the correct answer.

Certainly means surely which is opposite of likely. Hence, option 1 is the correct answer.

Rude means impolite which is opposite of polite. Hence, option 4 is the correct answer.

To repel means to drive away or cause distaste. The opposite is to attract or draw toward. 'Allure' means to attract powerfully or tempt, which is the true opposite. 'Charm' can mean attract but also please, making it less direct. 'Enough' and 'Unfortunate' are unrelated semantically.

Good fortune means luck or success. The direct opposite is adversity, which means misfortune, difficulty, or unfavorable circumstances. 'Fortunate' is an adjective meaning lucky, not the opposite. 'Disappear' is unrelated to fortune. 'None of these' is incorrect since A is the correct opposite.

To increase means to make something greater in size, amount, or degree. Abate means to become less intense or widespread, making it the correct opposite. The other words (abash, abhor, allay) have different meanings unrelated to reduction.

To brace means to strengthen, prepare, or support something against a shock. Weaken means to make something less strong, which is the direct opposite. Brusque means rude/manner, brief means short, neither is the opposite of brace.

Cruelty means being cruel or causing pain and suffering. Kindness means being friendly, generous, or considerate - the direct opposite. Agree means to consent, kidnap is abduction, relieve means to ease pain/comfort.

To boost means to help increase, improve, or raise something. Hinder means to create difficulties or obstruction - the direct opposite. Help is similar to boost, brevity means conciseness, vulgar means lacking sophistication.

To assent means to agree or give consent. Disagree means to have a different opinion - the direct opposite. Agree is similar to assent, ample means plenty, abash means to embarrass.

Passivity means accepting things without active response or resistance. Action means doing something or taking initiative - the direct opposite. Creed means belief system, deed means action done, fraud means deception.