Which word is an indefinite pronoun?

The word "anything" is classified as an indefinite pronoun because it refers to a non-specific item or concept and does not have a defined antecedent. Indefinite pronouns are used to refer to people, places, things, or ideas in a general way rather than targeting specific entities.

In this case, "anything" can refer to any item or concept at all, without specifying which one. This quality allows it to be versatile in various contexts, making it a common choice in sentences that require generalization. For example, in the sentence "Is there anything you need?", "anything" encompasses all possible needs without limiting to a specific one.

In contrast, the other options either serve different grammatical purposes or do not fall under the category of indefinite pronouns. "Indeed" is an adverb typically used to emphasize a statement, "intelligent" is an adjective describing a noun, and "although" is a conjunction used to connect clauses. These functions highlight how "anything" stands out as the only indefinite pronoun in the choices provided.