adjective
describes a noun or pronoun, in this case 'hidden' describes something that is not easily seen or noticed
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The hidden treasure was finally discovered after years of searching.
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I found the hidden stash of snacks in the back of the pantry.
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I can't believe she's been hiding a crush on him this whole time, that's so sneaky!
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Her true intentions were hidden behind a facade of kindness and generosity.