Synonyms

To 'adulterate' something means to make it impure by adding inferior or foreign substances. Therefore, 'adulterated' is the most similar in meaning to 'impure'.

To 'impose' means to force something unwelcome or unfamiliar to be accepted or put in place. 'Foist' is the closest synonym among the choices, as it specifically means to introduce or impose something unwelcome or unnecessary upon someone.

Prejudice refers to a preconceived opinion or bias against someone or something that is not based on reason. Bias is the most direct synonym among the choices provided. While prepossession also means a preconceived idea, bias is the standard term used in this context.

To classify means to arrange things into groups or classes based on shared characteristics. Categorise is the most accurate synonym for this process. Other options like index or catalogue are more specific methods of organization.

Curious describes a strong desire to know or learn something. Inquisitive is the best synonym as it also refers to being eager for knowledge or research. Prying and peeping have more negative connotations of invading privacy.

Accelerate means to increase speed or cause something to happen sooner. Expedite is the most appropriate synonym in this context, meaning to speed up a process or action. While hurry also means to move fast, expedite is more formal and precise.

Arrange is closest in meaning.....collocate is to set side by side. Marshal is to manage and assemble is to  gather or collect.

Perspicuous refers to something that is clearly expressed and easy to understand. Lucid is a direct synonym meaning clear and easy to follow. Rational and sober relate to state of mind rather than clarity of expression.

A spinster is an unmarried woman, usually one who is past the typical age for marriage. 'Old maiden' (or old maid) is the traditional synonym for this term. It specifically refers to a woman, unlike the option for an unmarried man.

Abhor and abominate both show extreme dislike. Hence, abominate is more closer in meaning to abhor.

A companion is someone who spends time with another or shares in their activities. Comrade is a close synonym referring to a companion or colleague, especially in a shared struggle or profession. Foe is an antonym meaning enemy.

A curator is a person in charge of a museum, library, or other collection. Custodian is the most general synonym for someone who looks after or manages a collection or property. While keeper and conservator are also related, custodian is a broad and accurate match.

Manufacture and fabricate both mean to make up. production is noun hence cannot be correct. Rest 2 words mean to raise.

Output means the act of producing i.e the result of a process.

Enclosures are areas fenced off for specific purposes. Paddocks are a specific type of enclosure used for animals like horses, making it the most similar term here. Fold and stockade are also types of enclosures, but paddock is a common general synonym.

Generous means showing a readiness to give more than is necessary. Altruistic is a strong synonym that emphasizes selfless concern and giving for the benefit of others. Benevolent and liberal are also synonyms, but altruistic captures the selfless nature of generosity.

"At once" is an adverbial phrase meaning immediately. Instantly is the most common and direct synonym for doing something without any delay. While instanter and forthwith also mean immediately, they are often restricted to legal or formal contexts.

To imitate means to copy the actions or appearance of someone or something. Mimic is a direct synonym often used when copying someone's behavior or speech, especially for entertainment. Counterfeit implies a fraudulent copy.

Betray means to run away after breaking trust. So, to desert is correct option.

Conspicuous means standing out so as to be clearly visible or attracting notice. Visible is the most direct synonym among the choices provided. Distinguished and noted imply being famous or successful rather than just being easy to see.