Here's a breakdown:
* Indefinite means "not definite" or "not specific."
* Pronoun is a word that replaces a noun.
So, an indefinite pronoun replaces a noun without specifying exactly who or what it is.
Examples of indefinite pronouns:
* Someone is coming to dinner. (We don't know who)
* Everything is ready for the party. (We don't know what things are ready)
* Nobody answered the phone. (We don't know who didn't answer)
These are just a few examples. There are many more indefinite pronouns in the English language.