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Jaded is an adjective; it is used to describe (alter) nouns, which is the definition of an adjective. Jaded has two meanings:

1. bored or lacking enthusiasm, typically after having had too much of something
2. (In Ireland, informal) physically tired; exhausted

Here are some examples of jaded in a sentence:

1. We serve meals to tempt the most jaded appetites.
2. I have to work tonight and I don’t want to become totally jaded before I even get there