noun
a word that functions as the name of a specific person, place, thing, or idea
preposition
a word that shows the relationship between a noun (or pronoun) and other words in a sentence
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The proposal to increase the budget is out of the question due to financial constraints.
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Going on a vacation next month is out of the question for me.
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Asking her out is out of the question, she's not interested.
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Trying to convince him to change his mind is out of the question, he's very stubborn.