irrelevant might the answer

un(A) un is your correct option

I don't have references for this, but I would be inclined to refer to your unnamed elements as superstrings, because your question is not really about prefixes, but about (prefixed) substrings; and a string that contains substrings can easily and logically be referred to as a superstring. (If you want to be more specific about it, you could call them "containing superstrings", which seems more appropriate in your example 2.)

Final Answer: The opposite of "relevant" is "unsuitable." Relevant means connected to the matter at hand, while unsuitable means not appropriate. Therefore, the correct answer to the question is option D) unsuitable. ; Explanation: The word that means the opposite of "relevant" is "unsuitable." To understand this, let’s break down the meanings of the words: Relevant - This means something that is closely connected or appropriate to the matter at hand. For instance, if you are writing a report about climate change, information about weather patterns would be considered relevant. Unsuitable - This means something that is not appropriate or fitting for a specific purpose. In our example, any information that does not relate to climate change, such as a discussion about sports, would be unsuitable and thus the opposite of relevant. In the multiple-choice options provided: A) pertinent - This means relevant or applicable, so it is not the opposite. B) courteous - This refers to being polite, which is unrelated to relevance. C) obstinate - This means stubborn, which does not pertain to the idea of relevance. D) unsuitable - This is the correct answer, as it signifies something that does not fit or is not relevant to a given context and is indeed the opposite of relevant. ; Examples & Evidence: For example, when discussing suitable clothing for a formal event, wearing shorts would be considered unsuitable because it does not fit the context. Similarly, when debating important issues, opinions that do not relate to the topic at hand can be deemed unsuitable or irrelevant. In English vocabulary, antonyms are words that express opposite meanings. By understanding the context of relevant and unsuitable, one can see clearly that unsuitable is the opposite of relevant.